Refueling only in friendly havens would be nice imo but in the current game state, regarding adaptive difficulty and war between fractions, it would be extremely tough to finish the game. I can definitely enjoy playing without that.
By the way, that whole thing with war between fractions and “people will always fight each another” mantra is one big pile of BS. Imo people will always make alliances when in need. For instance in WW2 two logical archenemies soviets and capitalist america were allied. Another example https://www.youtube.com/watch?v=MAAHgAuti84
A agree about equipment teleportation, it is one of the things that should be removed asap. Most annoying and boring thing in the game is reequipping teams with the same equipment before the mission. But for that to fix they should adjust difficulty too