wareyabecause of how stalemates work (spam contest on opposite sides of a chokepoint), it's all about whether or not it's easy to viably push into the other team
if you look at cp_foundry, it's like, impossible to break the stalemate between mid and 2/4 because you need to uber through the choke but /then what/
it's things like how cold/warmfront last is so hard to push, except in both directions and not as severe, that make maps "prone to stalemating"
saying that it's up to the players and the map has absolutely no influence on it is like saying that quad damage being gay in quake duels is because the players can't deal with it, it's like an ad hominem argument
If we look at Gran last theres Sniper stalemate.
But you dont have too.
Break the norm and let the game flow.