> I have never been memory bandwidth bound (Apple's excuse for soldering in the RAM)

This isn't even a plausible excuse. For the entry level machines, the soldered RAM only has the same memory bandwidth as ordinary laptops. For the high end machines it likewise doesn't have any more than other high end machines (Threadripper/Epyc/Xeon) which just do the same thing as Apple -- use more memory channels -- without soldering the RAM.

And it's especially a kick in the teeth right now because it means you can't buy a machine with less RAM than you might prefer and then upgrade it later if prices come back down. If it's soldered then only what you can afford at the right now prices is all the machine will ever have.