I am not a fan of this take.

It's possible to not make an engine, or use a 3rd party engine. You just make a game. Use SDL or something. It's honestly easier and more fun. Definately don't use Rust.

It doesn't take two years.

The more you focus on making gameplay, and not making an engine the better. Which sounds like similar advice to "use an existing engine", but it's not, because using existing engines is also a pretty sad time. You can waste just as much time farting around in Unreal as you do making your own engine.

At the end of the day, most people are just not serious about making a game. Using someone elses engine, building from scratch, both will work if you are actually making a game and not just wasting time.