When has Apple ever gradually removed anything? The iMac didn't gradually remove ADB or SCSI in favor of USB. Apple went all in with USB-A. 18 years later, they have gone all-in with USB-C. At least there are lots of USB-C to A adapters.Except it has now become very expensive to get a decent machine, and to make it usable from day one you still have to spend more money.
Whatever happened to gradually removing things so that you transitioned with your new laptop? Not a single USB-A port? i use an external mouse, so immediately the usability is out the window and i have to buy a friggin cable for a wireless mouse?!
As for mice, Apple's own products work without adapters as they use Bluetooth. But Apple has been emphasizing the trackpad for more than a decade now.