I guess if you want to have more gates you can play Vasari.. otherwise you can put 3 gates on key planets and hope for the best. Plus if something so unique to one race becomes easily available it could break the game. Honestly, I'm even surprised you can buy them at all.
Actually if we want to go even deeper :
- you can buy phase gates from Vasari tree (very OP combining with other races)
- You can get some minor perks for economy from TEK tree (far from being so strong as a phase gate)
- what can we buy with influence points from Advent tree? Or am I missing something?
obviously Vasari player 