Angels and paladins – how to use them? There are also discussions about them here.

It’s not easy to prevent this. When a player switches sides, they can easily start viewing the side they are no longer playing as the enemy. However, if players had to play for both sides simultaneously, that would be different.

Added 1 minute later
And the computer is slow, so the side with greater brute force will win, rather than the side with greater tactical potential.