Thing is, I don't think the viability of builds would be affected in any way if the effect of each attribute point was doubled or quadrupled right now. They'd all still be valuable to every character and every class. It's how they're designed.
That might or might not upset balance in some way (perhaps making some spell or other do too much damage, for instance) but that wouldn't be hurting viability - it would be hurting difficulty.
I don't think this is what (some) people are really upset about, although they are conflating it with the real reasons they're upset.
Would you stop with this mind reading crap all the time? It's getting annoying.
It's simple, stats should either affect things considerably or not be there at all. You should feel the difference between a 3 Might and 18 Might char in battle, there should be more of a consequence for dumping DEX etc. in addition to getting less starting points to allocate.
Different viable builds aspect through attributes is only interesting if said builds actually play differently, if you're encouraged to play to their strengths and forced to suffer for their weaknesses.
You should ponder during character creation whether to play a "safe" character that has distributed stats evenly or to opt for a more dangerous less balanced option with dumping one or more stats to max the other one.