Those arent even really features, I actually prefer the faster fade animation of going in and out of apps from Reduce Motion, and I dont quite frankly really care about transparent windows in iOS, (control center transparent, etc, big deal for that I dont really care about that)
Its not nessacerily disabling any features at all actually, it is just changing the look of the OS ever so slightly , thats all, no features or functions of the phone get disabled at all
You should try Reduce Motion and Reduced Transparency, it really does make it buttery smooth though(and I happen to prefer these two options on anyway because I like the fade animation Reduce motion gives better then the stock animation when going in and out of apps, and also I like the darker notification center with Reduced transparency, the keyboard is also darker in some applications which I actually like too