Maybe I'm just lucky to work at a place with good tools, but in my experience Temporal isn't super heavyweight to use compared to building your own even-very-simple scheduler.

And it's worth it because now you have Temporal, which is the bees knees as far as I'm concerned. I will gladly sing praises of any tool that saves me getting paged, and Temporal has that in spades.

Temporal is awful. Difficult to test, difficult to decouple from your domain code. At least that’s what I have seen in organizations. OP’s solution is rather understandable: with a couple of interfaces, you make the code easily testable.

second temporal. plus it gives you more freedom to write jobs in different languages... not that you would or should in most cases but there's definitely good reasons