I'm going to take a different tact of, instead of complaining about the underwhelming Switch Online features, I'm going to try and be constructive.
Here is a wish list of games that would sweeten the deal (and boy, these are wishes, for there are hurdles):
Famicom/NES games: Summer '92 Carnival Recca (which did get a 3DS release), Gun Nac (okay... there may be a bit of a shmup theme unfolding here...), Sweet Home...
Super Famicom/SNES: Rendering Ranger R2, Magical Pop'n, Umihara Kawase, Sonic Blastman 2, Sutte Hakkun...
Not the most extensive list (and not all of them necessarily being great games either), and there's more I'd add to that, but I guess the point I wanted to make is: all those games that I mentioned are crazy expensive were you to purchase them legally. Rom's, as illegal as they are, are probably the only opportunity most people will have to access and play games like those.
Having an online digital service is an opportunity to provide legal access, and to protect intellectual property, and really, to make a ton of money. Again, there are hurdles to bringing certain titles to a service, however not providing alternatives to illegal roms only makes people seek out illegal roms.
Again, trying to be constructive in criticism.