Buff's for champion abilitys?

I've noticed after patch 4.20 came out that champions seem to have more hp than normal making some champion abilitys rather weak.

example 3 turrets from + his ult and champions being able to dive him and kill him, while he uses Barrier and hourglass, That a good 5 seconds they are under fire by 4 turrets one being his ult. To me this seems to be very bad, and seems he is now useless since the damage from turrets was not scaled to fit the new changes.