[ACuriousGrey]

As a light user myself- I don't really think the problem ever was pyro or sanc flash- even if those spells definitely are pretty good at what they were designed to do. What I consider to be the real problem is actually lightspeed itself.

Using lightspeed with practically any spell in the game will practically guarantee it with little to no counterplay. Some very cancerous examples are:
Lightspeed > Pyro (still works after nerf as long as you charge first)
Lightspeed > Sanc Flash
Lightspeed > Charged Flashbeam
Lightspeed > Any wave (including spatial misdirection, that's a fun one)
Lightspeed > Sand/Metal root
Lightspeed > Fatal
Lightspeed > Flame Dash
Lightspeed > Whip > Beam

I don't really think I need to make my point any clearer about what I consider to be the true offender.