New to home automation -- How limited am I by old wiring?

Probably yes.

There is an option you can consider. It’s not quite as convenient because you have to change batteries a couple of times a year, but it will work fine And won’t require any rewiring.

Ecolink Recently released a battery operated zwave plus smart switch cover which fits over your existing switch and mechanically moves it. It’s actually kind of cool. :heart_eyes: it will work just like a regular Z wave switch, and looks like a pretty normal switch except that it sticks up off-the-wall a bit. The only negative, as I mentioned, is that you will have to change the batteries every so often.

There are some community members using it:

https://www.thesmartesthouse.com/products/ecolink-z-wave-plus-single-gang-toggle-wireless-light-switch-tls-zwave5

It also comes in a rocker style if you prefer that, although That one has been harder to find.