One consequence of changing the reward curve will be that it will be more profitable to cast 10 votes at 100% than more votes at a lower strength. So there will be less votes spread around. To what degree is this better or worse I am not sure.
Not necessarily. The curve applies to overall payouts not to individual votes. If more smaller votes allows you to target your votes more effectively and get better, or at least more consistent, curation rewards, you may be better off that way.
Agreed, I did some math on it and there is a small advantage to casting full votes but it's not much and it can be offset by having good curation efforts just like we have today.