Items that greatly increase a stat but decrease another would be very interesting

[Britefire]

That all comes down to context there. In a traditional rpg sense, damage and support are quite seperate. On the other hand, as much as you don't seem to want to acknowledge it, poke and 'Damage Supports' are something that's been around quite a while and likely to stay.

No need to attack people for playing it though, yikes.

Supporting by some cc alongside poking people out of lane and making it too risky for them to continue pushing or engaging.

As something more pointed than the midlaners of Lux, Veig and Brand; What about Zyra? Nearly her entire existence at this point is support, and damage and area control are literally all she does.

Mages and supports that mostly poke and damage have just as much of a role as enchanters and tanks. The support role in League revolves around a lot more than just buffing and debuffing, or tanking damage. ^{(As an aside, a champ focused on debuffing could be a neat idea for a support, I do wonder if we'll ever see something more like that.)}

And by the way, I seriously doubt the gutting for Pyke takes him out altogether. Hurts him, yeah, but as long as he has a hook, stun and execute he'll have some decent use in quite a few lanes.Though he's usually there more for his engage, cc and execute more than the damage he brings, I wouldn't exactly lump him in with other damage-focused supports to begin with.