How come you can't invite the enemy to play with you like you can an ally after a match?

While this can be walked around by trying to befriend them first or using the recently played list (which doesn't always update) I was wondering why after a match we can't directly invite someone from the enemy team to play on the same team with you if we thought they were really great to play with?
Best New

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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