PC's are limited to async comm's because the guys who thought it up didn't figure on high-volume comm's.

What in the world does that matter? If the PC designers were pure genius or "two french fries short of a happy meal" you would still have to communicate by the means provided.

You keep harping on existing designs, fine, you are entitled to your opinion, but if not you, then the rest of the world, would still have to communicate by the means provided.

From where I sit, however, it's too slow and inefficient to be practical. It works OK for a user-interface, a debug terminal, a printer, or something like that, but even internet communication gets away from that inefficient format as quickly as it can.
Well, if you want to communicate on the internet and do not want a whole lot of development, you will go ethernet with an XPORT and gasp, that one you communicate serially with using gasp, standard baud rates.

Oh btw, my current design goes 460k on RS485 yes, that is, indeed, "slow and inefficient"

Erik