If we could bring back the stage evolutions and reduce the amount of Digimon partners a character has to 1, then I'd be down for it.

That'd be my ideal.

As long as I get big organic beetle monsters and badass Angels, I'm golden,

This is what I meant by Seasons 1 & 2 and little bit of 3.

For me:

Have a Tamer have at most 3 Digimon partners, like in most games, and nothing more
If there's to be DNA Digivolution, and not that Xros Fusion stacking on nonsense, make the combo Digimon actually look like a combo of the two, not just a new thing that's slightly related (looking at you, Ankylomon/Angemon).
Final enemy is an evil Tamer and his partner, not just some evil Digimon or Data entity
Royal Knights, if they are there, aren't asshats and actually side with/look out for the protagonists when they're not busy
If not the Royal Knights (that would be a surprise), please use the Olympus Twelve as the go to mythological pantheon
Kumamon/Bearmon is one of the main partner Digimon. Because I freaking love DigiWorld 3.
Maybe not cards like Tamers, so as not to step on its toes, but how about have the Tamers supply elemental chips in their new digivices that add power to their partner's attacks.
A Matt stand-in that isn't as much as an ass that he was (like Koji, something I actually like about Frontier).
Maybe one person with a Digi-Beetle. Because I'm a sucker for a tank.
A Digimon with a White Mage role.

I don't think having an evil human and his partner would really be that interesting, to be honest. None of the human villains Digimon has had have really been interesting in the slightest, and I doubt it would work just because he'd have a Digimon by his side. Having an evil Digimon works because it's easier to implement, but can still have a level of interest and depth to.

Also, thinking of the main villains, of the 6 series, it's only been a Digimon half the time, curiously, so it's not like it's really that overused.

How about this, try to do again what they did in Hunters, have a Digidestined who's one of the main team and his partner turns out to be the villain and has just been using him the whole time.

also have a female gogglehead, it would be an interesting change of pace.

I absolutely hate Cherubimon's design.

Why?

Which design specifically? I always found his evil design intimidating.