I've done the pure builds, but in all honesty hybrids with a main focus and spreading your points out like jam on toast feels like the best way to just be brokenly overpowered.
Playing as a tank? Get hydro, geo, warfare, necromancy, for ridiculously broken armor/spell armor regen with absurd damage based on armor later on.
Other classes benefit the same from hybriding.
There just isn't a situation where spreading your points out isn't better than just dumping them all into one stat, with the exception of summoning.
Hopefully mods change this.