I work on games and I would not say, “this is how all major game-dev companies operate”. However, I have worked at companies that make their own engine and it’s

I work on games and I would not say, “this is how all major game-dev companies operate”. However, I have worked at companies that make their own engine and it’s easier than people think if you have the correct scope. Your first bullet is the most important one. I feel like the issue most companies have is that they get into engine building mode and get caught up in the fun of building the engine rather than delivering value to the player and shipping a game.