Many software engineering jobs only exist, because previous engineers made tools that make software engineering easier. Average game developer doesn't need to

Many software engineering jobs only exist, because previous engineers made tools that make software engineering easier. Average game developer doesn't need to know how to make a game engine nowadays. They can pick up UE or Unity and make stuff that they want. Corporations also don't have to hire an engine dev team. They can hire a few developers who can use a ready-made engine instead. The same applies to webdev - many frameworks and CMSes exist - no need to build everything in-house.