I'm fairly certain that if all mages had the quick summoning ability, either swarms would dominate the metagame, spawnpoints would be too op to be allowed, or both. Could you please explain your reasoning for thinking this would be more balanced and/or strategically diverse and/or fun, just in case I'm wrong?
However, I agree on one thing that it would be nice if level 1 creatures were useful more often for more than just swarms and pet effects. I imagine them playing support roles, such as with the clerics and the altar of skulls and temple of Asyra, or perhaps level 1 creatures with familiar and spellbind with no channeling and very low life and no armor, for short-term support. That could be useful in a buddy build if your opponent is occupied dealing with your big creature and you want a temporary effect that can be used about once or twice while leaving your mage action open for other stuff, before your opponent kills it.