Point allocation for Bard

[Bardo]

Personally, I think yes. 10k seals is nothing and an extra 3 DEX...well, that's 3 more DEX!

BASE Dex values for different races start at 17 and go all the way up to 23.
So if you run across someone that tells you 3 Dex matters, but isn't playing Elezen Wildwood(the race with highest base dex), they're just filling you full of hypocritical bull. :X

IDEALLY, you want 30 in Dex. YES.
But in reality, even 6 Dex simply isn't going to make a noticeable difference.

So if you happen to find yourself with the seals to reset your stats, go ahead and do it.
If you don't and don't feel like farming seals, then I wouldn't worry about it.
The gearing/stat requirements simply aren't tight enough in current content for a <2% difference in a base stat to actually matter.