Would this allow a user to have a "diskless" Mac?

I create bootable media, e.g. USB sticks or SD cards, for PCs and RPis and I can thus run "diskless"; no disk access is required and the full system fits in RAM.

I can insert the media into any available PC and use the computer, without disturbing anything on its HDD.

This can also be very useful for emergencies where a computer with a HDD will not boot due to some problem with what is on the drive.

Is this flexibilty possible with today's MacIntosh?