^^ And I like the changing aspect ratios, but as you said to each their own.
I see it more and more on TV from Truck Night in America to Westworld and even cartoons like Teen Titans Go, but I use a large 16:9 format and the drop to scope isn't as as great of a change going from 151.5" of flat to 143.5" of scope. I know that the director is going for a different "feel" when the aspect ratio changes and that even a "meh" movie like the recent Ghostbusters pops more with the transition from scope to "IMAX" during the action scenes.
...but last night during four hours of Leaving Neverland (scope) I ended up stopping the show during a transition from the scope presentation to old 4:3 footage, and asked the wife what she thought about the smaller content in the already smaller scope box. We agreed that it would have been better if the old 4:3 had expanded rather than decreased to fit the 143.5" scope box which for us is 4:3 of 123.79" vs 93.65". The drop from scope 143.5" to 4:3 of 93.65" is a cliff compared to the gently sloping hill that 151.5" is to 143.5" (16:9) or even a transition to 4:3 of 123.79".
While I can see the merits of a scope screen especially when many home have more width to work with than height, or where seating/personal preference/etc. come into play, it would never work for us given the diversity of aspect ratios that we encounter every day. Between Amazon, Netflix, hundreds of cable channels and the 50/50 split of commercial movies, along with IMAX/changing aspect ratio movies, for us...and maybe only us, 16:9 is the best "box". It does every thing well and everything from scope to 4:3 is represented as large as possible given my current home/equipment.
On commercial cinemas...IMAX/scope/etc., I refuse to go. It is just a "let down" vs the comfort of my own home/bathroom/snacks/fellow watchers/sound and even image quality even with my simple equipment/room (no spotlight exit signs, movement in front of me, no cell phone lights). Even with the occasional boredom of the last few years of retirement and a "new-ish" theater within a few miles, we are never tempted to drop in for a movie "day".
At the end, it would be sad for us to have to look at/for the aspect ratio of content prior to watching just to make sure it fits our "box"...but I'll admit, my purchase decision is often swayed towards buying a changing aspect ratio movie just for the "uniqueness" of the presentation rather than catching it for free..ish within a year via Netflix, Amazon or premium cable channels. I actually believe it is cool
when a director makes the choice to be different with their art...but it is not a "cliff" transition for us. I noticed when the first Avengers movie came out people complained about the 1:85:1 aspect ratio which seemed odd, but I realize for many on the forum it is a cliff transition come movie night. If I had limited myself
to a 143.5" scope screen the drop to a flat blockbuster would've been a cliff drop to 114.61" instead of a "mild" transition from 143.5" to 151.5". (I know that some manipulate the 16:9 to fill the scope so no cliff just odd framing.)