What term has replaced the term “microcomputing” from 1986?

In the early days of computers, computers were huge machines that filled gymnasium-sized rooms. Over time, they got smaller until a market segment of computers that could sit on a desk appeared. Those computers were called microcomputers.

Eventually, all computers were miniaturized to the same scale; "mainframe" computers were just slightly bigger, more expensive micros. There was no longer a need to distinguish between microcomputers and any other kind of computer so the micro- prefix disappeared.

As for what "replaced" it, the various other computer terms have replaced it. Microcomputing is just computing with a computer.