So you don’t actually care about being democratic as end in itself then.

I care about representative democratic republic with system of check and balances. Basically the system majority of people imagine when someone mentions democratic countries. I think it’s the best system that showed itself to provide prosperity, stability, respect for human rights and so on.

Grouping them into distinct parties doesn’t make it more democratic and I can’t see how it adds checks and balances.

The problem there is with checks and balances. Allowing other political parties to take your place if you f up, is an important part of it.