What would you call the TA-SC-PA subgenre?

“There’s really only two categories of music that matter: Good and bad. Everything else is just indexing.”
— Hugh Laurie

I believe what we have here is an attempt at indexing.

D: bad things are going to happen to you 'mboy.

Is metal fatigue in this subgenre or is it too different?

IMO, yes, it qualifies.

Hugh Laurie is a bad philosopher.

Like......diesel punk?

I dunno, could be one of those variants of punk things.

EDIT: http://en.wikipedia.org/wiki/Cyberpunk_derivatives

Well the one thing that sets this apart is the comm.

Robots, no robots, doesn't matter, lore and aesthetics that. They are soldiers: individually valueless, very small pieces on a very large board.

The commander however, well he sets these types of games apart, kill him = win. So despite the grand strategy, despite the thousands of units killing each other, it's the commander that is the only essential macguffin in this game.

but I can't think of any catchy way to put this into words

ARTS "Assassination RTS"?

That's just waaay too close to A RSE for my liking .
But it is accurate

Sci-fi RTS. There, done. Simple. NEXT!

i call it ... AWESOMEBAAAACOOOON !!!! ... ... with a starting low to rising high pitch from awesome torwards bacon ! ...

Why are we focusing on the setting? you can have sci-fi FPS, fantasy FPS, historical FPS, they're all FPS because they share the same core mechanic, shooting from a first person camera view.

The name of any sub-genre of RTS that involve the TA, Supcom, and PA mechanics need to be named focusing on the core mechanics, those being the streaming economy, large scale, and starting with a "king" unit which instantly loses you the game if killed (since assassination is how the game is ideally meant to be played.)

something like streaming RTS or commander-stream RTS would be much better at describing the genre, since anything talking about sci-fi or art style is totally irrelevant to such a genre. you could take PA, and reskin everything to work in a fantasy/magic setting, and it'd still work, it wouldn't change genre for lack of being sci-fi.

Assassination RTS is also ok.

The genre is simply "total annihilation clone". The old game was good enough to spawn multiple remakes and re-imaginings of itself.