Added numbers above to your points:
1 of all the things that failed on my devices, the mute button is not one of them. How many have failed for you? Or others reading this post?
2 how is that specific to a solid-state button? Same could be done with the slide switch.
3 See #2. And maybe in theory yes. Sounds to me like the logic behind replacing function keys with the Touch Bar on Macs. Unlimited flexibility in theory, but limited usefulness and practicality outside of Apple’s labs and marketing offices. Remember, we’re speaking about one of the few very often-used-functions (muting), like volume and on and off, which has deserved a unique, focused button to date. What are any potential customizations you’d be interested in remapping? Curious as to what might deserve to be prioritized like mute, volume, and power. Maybe it's already customizable within the control panel?
4 see #2 and 3.
in fact, as a version one way that designs are sometimes considered, extend your argument one step further, and then some. (Check for: is more necessarily better?) Would it be even better to replace the volume, mute, and on-off buttons with one solid-state button each that could be reprogrammed and remapped? Or combine them into a single button: quick pulsating press for volume up, slow pulsating for down, longer press for mute, longest press for on off.
Also, at one time wasn't the mute button programmable to be either mute or anti-rotate? Was it better back then? For some reason anti-rotate function there went away...
5 see #2.
6 Instead of “plenty of advantages,” it sounds like you’re focusing on “plenty of options.” You’re very unfairly oversimplifying and dismissing the “harder than before” thing. Remember, the physical button with a certain position offers certain visual and no-contact state indication that’s useful to many, for a very important often-used function Apparently ranking up there in importance with volume and on and off.
My point is, sometimes that design reaches a certain maturity level that any further simplifications are just change for the sake of change that are even worse when it’s a step backwards in some aspects. This approaches that.
First of all, comparing the TouchBar (which replaced basically something that existed in every computer for the most part the past 30 years) to a tiny switch (that exists mostly for convenience and as far as I know isn’t on many android phones) is a ridiculous argument.
Android phones have existed without mute switches, the iPad ditched the mute switch Nine years ago, the iPod touch never had a mute switch, the Watch doesn’t have a mute switch…
Feel however you’d like about it’s possible demise, but it is absolutely nothing like the TouchBar.
Personally, I’ve never had a mute switch fail, but I have heard of it happening, and I have had a power button fail.
As for re-mapping, personally I’m one of the several who rarely changes the position of that switch, so I’d rather have that button specifically for the accessibility shortcut instead of the power button.
I’d also like if a double press could open my app of choice, or run a shortcut, or (as you already mentioned) take a page from the early iPads book and turn it into a rotation lock button.
Also, one possibility I haven’t seen brought up here is that this can make phone restarts a lot easier than they are right now.
Instead of doing the “press up, press down, hold” series of steps, it could be simply just “hold power and mute together”.
Lastly, as I said, I’m not going to be convinced about the “simplicity” of the switch, if you can dig into your pocket to feel where the mute switch is you can click the button that’ll be in the exact same place just as easily.
If you absolutely need a visual indicator, meaning that you’re already looking down at the phone, they can easily put one in the status bar. In fact, I’m pretty sure that “muted” and “rotation lock” iconsused to be in the status bar back in the iOS 6 days. So there’s your visual indicator right there. And since this is coming to the pro phones, it’ll obviously be on the always on display… always.