Well, you can’t use that kind of reasoning because it’s simply ‘this class has X benefit therefore it is always good’ - I’m looking at it more from a synergy perspective.
When you take alch that usually means you have only 5 ranks to play with. I doubt people would squeeze in W3 there because W3 needs follow up dps classes in order to be really good - like Ele3 or Kino3.
Most Alchs either go 2 routes - support (cryo, linker, thaum) or if they go the dps route they take pyro linker or cryo kino. That’s because given only 5 ranks, you have to choose something that doesn’t take more than 5 ranks to be effective, which are the above.
But that’s off topic haha sorry for digressing.