[Nyara]

Spikes and Rapid Spin are from the 2nd Generation, not third, RSE din't introduced anything to hazards at all, they just made it stackable. The 4th Generation introduced Stealth Rock, the most broken move always made, and... Toxic Spikes. The 5th Generation did nothing against or in favor of the hazards, they just keep it as it is without any modification, maybe they din't debuffed it thinking Volt Turn could be too broken without hazards around.

Anyway, Hazards DOESN'T need any kind of buff, they are already too broken with Stealth Rock, Spinblock is barely a problem with some nice Ghost-types around, and even if you don't carry Ghosties, you just need to K.O the spinner, and with exception of few, the spinners are really horrible, not exactly because they're bad, but because you have to forgoe a move slot in order to use Rapid Spin; a move that doesn't do anything else than remove hazards, that makes troubles.