It'd be quite ironic if Nintendo pushed old gamers to PC because it's the easiest way to emulate Super Metroid and the like. Hard to know what Nintendo's thinking here.
What do we make of Nintendo's past practice of making you buy old NES/SNES games on a per-console basis anyway? That seems like a concern that if they sell it once and allow multi-platform playing, then they can never sell it again. I think the desire to not devalue their old games is probably the most likely culprit here, so I'd say their protecting their ability to do remakes. But if that's the case, Nintendo could be, like, actually doing way more in terms of remakes than they are. Iunno.