[Snake]

Willpower should really be 1:5 instead of 1:10. Building WIL in any circumstance will only make you 'lose' skill slots. It doesn't do anything but give some FP and Status Infliction anyway. It's a weak stat to invest on.

If we imagine something like this, investing 100 points and somehow is still counting as 'scaled' ((This won't be accurate due to how things go beyond 40 points, but it's an example)):

50 WIL/50 SKI = 15 slots.
50 WIL/50 GUI = 15 slots.
50 SKI/50 GUI = 20 slots.
34 WIL/33 SKI/33 GUI = 16 slots.

If WIL was 1:5, instead:

50 WIL/50 SKI = 20 slots.
50 WIL/50 GUI = 20 slots.
50 SKI/50 GUI = 20 slots.
34 WIL/33 SKI/33 GUI = 20 slots.

That means, if you build WIL in any case, just for the sake of some FP, you'll be losing skill slots. And WIL doesn't even give much of a benefit to non-basic attackers. While SKI and GUI will always be present in one's basic attackers build. But basic attackers don't use skills as much as magic users or offensive skill users.

It doesn't make much sense for the people who don't need skill slots, to have skill slots, while the ones who need skill slots, not have them. WIL should really get this small buff so it stays toe-to-toe with SKI and GUI on the skill slot role, in my opinion. This seems to be my own personal concern about skill slots, and what the problem seems to really be. It's not that there isn't enough slots, it's just that WIL is doing its job poorly.