Again that comparison doesn't really make sense since more free use of pylons after their initial unlock allows more possibilities with building. Gear is a totally separate matter from build style. I prefer Corruption, but the game lets you pick which evil you want. You can pick Corruption, you can pick Crimson, you can pick random.. and you can get the other evil's seeds from Dryad in the Graveyard biome. The game gives you CHOICE here, with pylons, you either get them by how you build, or you do not. They also try to balance the game so every class is just as viable.. which is arguably "every class doing the same damage," or roughly. I really don't see how this comparison holds at all to be honest.
Pylons make it easier for those who spread out their NPCs to access them, but the problem is locking pylons by NEEDING NPCs nearby them, since those who prefer to keep them together cannot use them. To follow your comparison, imagine if only melee users could use recall potions and the magic mirror and upgrades. That would influence the player to stick with melee. Magic Mirror is usable by all, and Pylons should be usable by all as well.
Zenith is the most powerful weapon in the game even used by rangers and mages. It's a melee weapon but with that much power, it's practically classless. They could add more Zenith-tier stuff it they want, but I don't see how this relates to build style influence. You can still wreck stuff with endgame mage/ranger stuff.