I don't know much about the various 'devices' out there. I do know each and every one of them are unique and that not one of them can do everything except for one very specific device. Your Windows 10 PC. It and it alone is the only 'device' capable of doing EVERYTHING especially when it comes to high bitrate audio, video, and in this case, proper frame packed MVC 3D. It also never made much sense to me to have 1 device for ripping, another device to store/serve the rips, another device for playback, and more devices picking up the slack of the 1st playback device, and so on.
I see the forked build of Kodi (not official and dependent maintained by 1 developer) mentioned here. It is hardware specific. It's designed around an NUC. It is limited to 1080p playback only which was fine back in 1080 days but now that 4k is here, it's obsolete. It's also free hence you get what you pay for. Furthermore, this NUC device and ALL others like it are limited to rendering from an HDMI 1.4 port ONLY. It is not capable of rendering via a modern HDMI 2.0 port and simply non compliant. A Windows 10 PC with a half way decent Nvidia GPU IS capable of all that and much more. None of these devices are economically upgradable either, another beauty of a PC. Mine is circa 2008 and there is nothing I can't play 100% perfectly let alone rip, serve, stream and compute. (I'm not big on streaming or the limited bitrate of sources). There has been a shift from HTPC's to these glorified devices that are simply limited. Why? I suppose 3 reasons. They sell to the lazy folks that will settle for all their shortcomings because all they have to do is plug it in and they make great gifts for those that rarely watch TV let alone movies. These users are not avid. Most of the devices come preloaded ready to stream free content. The content is low quality compressed junk with clogged servers unable to accommodate the masses cutting cords but still paying for that internet. Eager developers and manufactures will happily take your money and youtube hits as long as users are willing to keep bending over, stay uninformed, settle, and digest non HTPC propaganda in exchange for their pigs with lipstick.
With HDR in the forefront, 3D has been set aside. Imo, once 4k/HDR/etc. has been milked, 3D will make a miraculous comeback, forcing all present and near future displays to ahem, upgrade again. The new creators update enabled fake HDR and does not work nor look very good. Windows with PowerDVD 17 is the only combo that can play HDR properly. This from test files available on the net. I tried the whole madVR with LavFilters thing. It is CPU dependent with no hardware decoding allowed. This means unless you have an expensive very high quality CPU struggling with the work load, it is not going to work period. PowerDVD handles this with ease using ancient hardware such as mine. Point being, there are many, many benefits to a Windows 10, PowerDVD, Redfox combo that ends up being FAR less expensive than any other route if you do the math. Given you already own a PC (how else are you ripping?) the cost is further reduced.
You emphasize your "box with Kodi on it". Kodi is free open source software. You just install it and tailor it to your choosing. The sky is the limit from simplistic to bells and whistles you could never imagine. Your box is nothing special simply because it has Kodi on it. Kodi is NOT very android friendly btw.
Any ROM will mount iso's. There are virtual ROMS making the whole digital experience better. You want to get away from physical discs and now you can get away from physical ROM's too. ROMS 'mount' your iso. Once it's mounted, it can be handed off to players. Your physical ROM is still needed to rip the physical disc though. Very soon physical UHD ROM's will appear. At some point ripping from them will be developed much like the pioneer days of Blu-ray except there are more challenges these days due to greed and legalities than in the past.
Yes, the movies get huge ripping high quality mkv's and yet another reason to stay original iso imo. Most opt to give up quality in exchange for transcoded file size due to this. A few years ago there were no high quality mkv rip discussions so I decided to do it and present my accomplishments using my ancient PC and FAB. 3840 x 1080 had been done. 3840 x 2160 had not. A rip took about 24 hours. FAB was not 4k popular at the time but doable. More here at post 109 http://forum.kodi.tv/showthread.php?tid=113646&page=8
and more details at post 143 and onwards. Today I use Redfox for iso which performs better than FAB imo.
I also wrote a 3D guide years ago I maintain from time to time that may further assist you. I'm not the best guide author and as hardware, techniques, and software evolve, it's easy to become messy. Windows 7 to Windows 10 and 1080 to 4k kind of jumbled it but it's all there. I apologize for that. I can't seem to link it here in my signature for some reason? Maybe someone could help me? Anyway, here is the link http://forum.kodi.tv/showthread.php?tid=229692
and any questions I'd be happy to assist there. Above all, if this turns out to be a hobby and converts you to an enthusiast....... have fun!