Returning player here. Last time I played, Viper had made his 20th(?) tower ''masta piece''. Around the same time, towers got nerfed, almost halving their HP. Didn't seem like a big issue to me, just walling them in. Never the less, pro players (and players in general) seem to have drastically ceased using towers. Why? and apart from Arena/Hideout, are they no longer an optimal strategy?