I’ve been using iPhone for almost a decade now and I have no issues navigating without a universal back button. If anything, I’d prefer to have that screen real estate rather than a navigation bar glued to the bottom of the screen constantly.

I know it’s a personal preference and if that works for you, it’s not my business to tell you otherwise. I just don’t understand why people talk about the absence of those buttons as if it makes the phone unusable. It’s just a slightly different method of navigating.