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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.

Okay, let's take an example, an easy one.
Let' s suppose user A has 120mv, and user B has 61mv.

Let's say, there are only user A and user B in the network.

In the situation of 30 witness votes: User A will define ALL 30 top witnesses. And user B has no say at all. User B can only change the order of the top 30, but can't vote his own candidate into the top 30.

In the situation of 10 witness votes:

Two Situations:
User A will either define ALL top 10 witnesses (if he doesn't split his stake) and User B votes the remaining 10.

User A splits his stake to vote ALL top 20 witnesses. But now, user B doesn't split his stake and now has enough stake to vote his 10 people in the top 10.
(61 > 60)

Of course, people will always try to maximize the system. But the entire point of this system is to make sure, that the top stake holders don't have as much influence on the top 20 witnesses.

Especially since witnesses 1-20 have the power to make all the decisions in relation to hard forks etc.
With >= 20 votes, pumpkin has an enormous influence in this. If we reduce this to <= 10, this helps a lot.

I'm not talking about saving the world, but I'm talking about decentralizing the election. And reducing the number of votes, certainly does that.

And I agree, this can be further reduced, to 5,3,1. But I think 10 is a good number. 10 allows people to select a number of witnesses which represent them well and they think represent Steem well while not giving anyone enough power to have such a huge influence in selecting ALL top 20 witnesses basically alone.