• Not 100% sure but at this point it should almost be there. For those where it’s not (Pull to refresh for example) you can extract the code yourself and make it build without m2,
it’s not that hard.
• I would guess here that it’s mostly maintenance, but could be wrong, you can check the latest release notes to get an idea of what is being changed there
• If you are to go to m3 eventually anyway, just do yourself a favor and use 3 directly. Or else you’ll have to spend time to migrate anyway. But yeah m2 + m3 at the same would actually work, most of your problems will be from accidentally referencing the wrong thing, and from having to define both color schemes. We do that as we started just with m2 ~2 years ago, and the migration is still slooowly but surely being done. But if you can avoid it, avoid it.