I think there's a difference between "creating your own game engine and then building a game in it" and "creating your own game without a game engine." The for

I think there's a difference between "creating your own game engine and then building a game in it" and "creating your own game without a game engine." The former is much less focused and you're much more likely to build things that are not exactly what you need, more general than you need, or just because it's some feature a game engine usually has.