Minecraft and Terraria are to me the definitive mining/crafting games you can find.
Stardew Valley sets the bar for farming sim.
The Messenger holds a nice contender of a well-balanced game, one of the best in its ranks.
There will be no better ARPG contender to me than the Diablo series, even if Diablo has made some questionably dumb choices.
The Elder Scrolls II: Daggerfall/Fallout 1 and 2 are some games that demonstrate the importance of depth and how your choices matter in their games. Something I feel nearly all RPGs should have.
Depends on the game. Most times it's not even worth it because post-game after beating the game, usually means another round with only tiny differences.
I've done Super Mario World multiple times, completing the Star Road and changing the koopas to have the mario heads. I've done The Messenger to get the Wind Shuriken, which honestly in my opinion, wasn't worth gathering all the power seals for.
Elder Scrolls II Daggerfall, didn't really feel like there was anything post-content that is there to it, after doing everything. You just continue until you're bored, which you could already do anyways by ignoring the main quest after getting the letter to meet that lady in a tavern so you wouldn't be soft-locked out of it.
It just depends, if there's more meat to the bone there is, then maybe, if not and it's just going another round of everything again then no.