You can absolutely approach it that way, but AFAIK those are highly integrated but still discrete solutions. Temporal provides a unified model for these things instead of requiring people to stitch things together themselves. Due to Temporal handling all of the things, you also get additional value out of the centralization (you can see the live source of truth for any running business process).

I do agree that Temporal is heavyweight both in terms of the learning curve and deployment requirements.

For disclosure I’m the Head of Product at Temporaly. We know things can be better and we are working on it.