I've found when an app acts up, hell even when you arent getting reliable streaming from an app (see Netflix PQ ramp up), a reboot fixes it. This is from Roku experience, and if you look into it on their forums you will note it was not isolated. While I have found no need to do it on the fire sticks, since they put that easy and fast reset, I use it.
In comparison, my wife never reboots her iphone, I do after any app updates. When she starts having funky issues, a soft reboot fixes. Do the math on that one.
I also don't have issues with a windows laptops if I dont reboot them, I just do. After updates or prolonged use, a reboot is just better safe than sorry. Doesn't mean you have to, and it is personal preference for me. Same reason I don't use the fast boot on blu-ray players. The ONLY problems Ive had on players in the last few years were with fast boot on. I just stopped using it and don't have quirky problems. Not saying all players would require this, but it saves me potential grief.
I also reboot my Tivo and Direct DVR once a week too
Some people don't change their transmission fluid ever, others do as scheduled. Life choices.