For PvE wizards in ToS, stat distribution is rather easy, yes. Though there are valid paths for STR wizards, which is pretty interesting.
However you make the comparison to wizards in RO - in RO there was no good alternative build to all INT/DEX. You try casting a storm gust with less than max DEX and cry as the cast bar slowly fills up. Try getting less than max INT, and realize that the mobs you’re killing don’t die in one storm gust, so you have to cast another one, essentially doubling your cast time. If you sacrificed either of these things you were a bad wizard.
Archer with no STR though? No thanks. Getting almost all DEX may seem the simple easy solution, but your DPS is far lower than someone with a good amount of STR. Especially if you’re a Wugushi, where your poisons are scaling off of STR and can’t crit.
Just like in RO though, this changes when you bring PvP into play. A pure PvE RO build for archer could be 99 DEX/AGI, but you would need VIT to be viable in PvP.
In ToS, SPR raises your stat resistance ( it’s not lumped into CON / VIT like it was in RO ). So if you want to be resistant ( on any character ) building SPR is an option. So it becomes a balance of STR/CON/DEX/SPR. Even for wizard, this can become a balance of INT/CON/SPR.
So in PvE, cookie cutter stat balances can work well, just as they did in RO, but in PvP you need to think more about it.