I don't have an Xbox or PS so not really bothered about what their services are. I guess a trickle rather than a drip feed is OK, it should be a lot faster than it is now though.
Knowing the majority of the NES > N64 Nintendo back catalog is coming at a reasonable pace would be a reason to subscribe to their online service, assuming it is all available at the base sub price.
Why? no one expects all PS1 games on PS now, nor all OG Xbox games on gamepass.
If people still want to buy ports or subscriptions instead of figuring out emulation, that's their choice.