Can't agree with that more. You will be able to create your own games from the ground up using this method, even if there is more of a time and mental commitment that is required.
Viewing post in game engines
That’s not true. Most engines, big ones like Unity and Unreal included, use plenty of middleware.
I don’t have to build a physics engine, graphics engine or sound engine for it to count as my own project. As a software engineer, you simply have to pick the right tools for the job.
In contrast, by being made for every use case, Unity and Unreal are never the right tools for any job.