I need the company to have skin in the game, so I prefer that I am entirely unreachable outside M-F 9-5. Otherwise they just exploit people who submit far too quickly to being on-call 24/7. It also gives me motivation to make my stuff work as best as possible so that I'm not being annoyed by management about my non-existence outside core hours.

But I really do need the company to have a competent plan for handling issues that isn't just, "call the developer." It's amazing how much it makes them care about proper support and testing when the alternative isn't exploiting a developer, but is a customer outage.

To me the best compromise is put a price on it.

Realistically nothing is perfect, there will be cases where something randomly breaks and will need attention after hours. Responding to a call for this should get you double pay for your time. Plumbers and electricians work this way, why not software folks?

If it absolutely has to get fixed, the company will pay the cost. If it can wait until Monday morning, they can save that cost.