If you're carrying around a USB-A keyboard then fuck off pretending that also carrying a much smaller USB dongle is somehow an issue. If you're only using the keyboard at a desk, then you likely have (or would benefit from) some form of dock/hub there anyway and the size of the hub is irrelevant.
Some much of this port argument smacks of laziness or just a general inability to make perfectly viable adaptions to the modern world. You mention USB type B as though that makes your case because of the difficulty of finding a Type-C to Micro-B cable, but it does the opposite because you can buy easily buy a tiny little Type-C to Micro-B adapter which you can use with any Type-C cable (as you can lightning, mini USB etc) that are far more convenient than carrying cables around for each of them.
The rest of your point just reads like using strawman arguments because the underlying point is weak. What laptops don't have 3.5mm ports? Other than USB-A which of your 'top 4' ports are laptops regularly missing? Are you carrying a HDMI cable around with you as well, or are you just relying on their being cables wherever you need to connect to a screen (yet somehow not docks or dongles)? Who cares if you can't get USB-C to RS485 adapters, you can plug a USB-A one in via a Dongle or buy a tiny USB-C to USB-A adapter, and if you are carrying adapters like that around you can carry a dongle about the same size as well.
I work in IT, supporting equipment in a factory, and can do it all via USB-C ports, a small dongle, and half a dozen dongles smaller than the end of a USB-A cable. The vast majority of people want the devices to be more portable, not festooned with half a dozen or so extra ports that add no value for them and bloat the laptop.