It's similar overcompensating logic as people use to now rename git branches from 'master' to 'main' or whatever -- even though the concept of master was never anything about, or analogous to, slavery (i.e. there are no 'slave' branches -- it's just not the mental model, at all). Keep in mind that it's ostensibly smart people doing this.

Surprisingly (but maybe I missed a memo), the Serial Peripheral Interface (SPI), is in fact defined in terms of master and slave devices; but, I'm not aware of any movements to redefine it. The embedded systems world has not (yet) been cleansed and re-educated.

It's a new Puritan era.