I was amazed to discover that Firewatch (Unity) was pretty playable on my 2013 MacBook Air. I'm wondering though if that's a property of Unity itself, or more o

I was amazed to discover that Firewatch (Unity) was pretty playable on my 2013 MacBook Air. I'm wondering though if that's a property of Unity itself, or more of a cultural thing. Could it be that those who use UnrealEngine just focus more on high-end games?