As for Dexterity itself, I just tested this with Scarlett. 1 Dexterity gives 5 OR to Dex Weapons, 5 DR (i.e. evade, which is difficult to quantify, you start with a base of 60, and with 14 Dex Scarlett has a further +45 to it), and a 5% chance of success with Dex skills. Staves aren't Dex weapons, so that leaves you with two other benefits, but from what I've seen and tested that extra 5 doesn't make or break anything.
No, one point would not break or make anything "IF" you aren't a build that has any attention into Dex. Though... "IF" you are a hybrid that balances some DEX to use some DEX based skills and then relies on some gear to push it up to a percentage that is acceptable for their use, well... then... that 5 DR and that 5% increase may be part of a build that is useful.
Now if you have NO dex and place all of your points into a single or other stats, then no, 1 point isn't going to make that much of a difference...
But then... the entire game does not center around how YOU build your characters because how YOU build them is not the only way to build them, regardless of how wrong you think everyone else plays.
Seriously, why am I even bothering to explain this?
