USB-A is too large to really use as a port on things like
phones
mouse charging ports
USB-B, mini-b, micro-b and the other hackery standards of B that are intended for the "device" end of a USB-A cable also need to die in a fire. As tech guy I literally have a bag full of cables to plug in the various standards on the below chart.
Ironically, the advice from some who are anti-USB-A ports to others is to get a USB-A-to-C adapter or a cable that's USB-A at one end and C at the other. So again we may end up with your 'bag full of cables' situation.
What you describe is a 'chicken and egg' issue - as a tech. guy you need to a bag full of cables to prepare for the variety of devices you may encounter. Many computer users, on the other hand, like their computer and/or dock to have a 'bag full of port types' to accommodate whatever variety of peripheral cables they may encounter.
I don't work in tech. and I've got a mix of cables and realize the dream of a 'one size fits all' standard has appeal. For me, micro-USB vs. mini-USB charging port interfaces annoy because they look so similar.
Seriously... all of that trash (some of which people may not have ever seen before, never mind be able to name - not just "A") can be replaced with type-C everywhere.
PLUS displayport, mini displayport, thunderbolt and proprietary charging.
You hit a key point with the term 'replaced,' a verb, an action word, and as we know from science, action requires investment of energy to drive a process.
In other words, replacing things has a cost - material, financial, hassle (e.g.: researching options (e.g.: new product, cable vs. adapter, order it), etc...
A lot of people just aren't that into it. If their computer or new dock has some USB-A ports, and they can plug their old gear right in, that's good. If they need to order or go buy something else to make it work, that's bad. These people aren't concerned about a tech. sector culture war to drive USB-A into extinction.
Ironically, there are USB-C to HDMI adapter cables, but I don't see a big push now to get rid of HDMI ports, as enough people find them convenient to have built-in. Apple got rid of HDMI in MacBooks Pros, IIRC, but brought them back due to pushback.
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Both sides of the USB-A port issue have some good points.
I have seen some anti-USB-A port sentiment go farther, though; in another thread, some people resented that a new CalDigit Thunderbolt 5 hub included some. It's like that thing is a form of 'dongle,' an add on to your Mac's built-in ports.