The trouble is that the third-parties have all sorts of aspirations to make a lot more money by 1. doing half-effort "remasters" of their works into some kind of "Collection", that 2. they can then charge full "new small game" price (~$15) for.

The fact that these third-party publishers are doing this despite adding basically no value (and often stripping away value, by e.g. not supporting rewind / save-states in their own emulation) is bad enough. But often they don't even actually do this; they just vaguely think about doing this, and the imagined potential upside of the option of doing this, keeps them from going with Nintendo's option.