Ask HN: Is 13" MacBook good enough without an external monitor?

I want to buy a 13" MacBook Air, but I'm not sure if I can have a comfortable development setup on its small screen without an external bigger display. I don't need to have multiple applications side by side I open everything maximized. It would be nice to be able to play some games (e.g Factorio, DF, LoL) as well.

I'm targeting 13" mostly because of its mobility as I'm planning to work on the go. As a side note: I never owned a MacBook. I appreciate any notes or tricks.

Any thoughts or advice?