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But it reduces the slide each of the people get, that's the entire point I'm making.

I really don't get your point.

Right now everyone has 30 witness votes. Where each witness vote is worth the full vests the account has. Let's denominate this as "x" vests.

If the account only voted 1 witness, this witness would also only get one vote worth x-mv, thus, he should vote 30 times since this way he is able to distribute 30 x-mv in votes.

If we restrict his power to 10 votes, he will be able to vote 10 x-mv in votes.
And if he splits this up, it's not worth it.
The total quantity the account is able to vote is 10 x-mv, or 20 x x/2-mv or 40 x x/4-mv, but the more the account splits it, the more difficult it will be to make the vote decide who is in the top 20.

It is really easy.

Right now, his 30 votes, can basically vote all the top 30 witnesses => Very strong influence!!!
If he only has 10 votes, he can only vote the top 10 witnesses => 50% of the top 20, much better.

If he splits it into 2x10 votes, each of these votes is worth only half. (Yes it is still worth a lot, but only worth half than what it'd be if he hadn't split it)
So, if the orcas and dolphins don't split their stack, each of their vote is worth more now after the change (because they didn't split their stack).

His overall influence compared to others is the same, but his influence on the top 20 is now smaller, either because he can only define the top 10, or because his vote will only be x/2 compared to the people who don't split their stack.