I splurged a while ago and got a pre-assembled Core One. It worked great right out of the box and is has been worry-free so far. So far, I've treated it very much like an appliance with no tinkering on my part yet.

The machine is still quite hackable. Prusa publishes the firmware and CAD files for their printers, although the CAD files aren't under a fully open license. The support is generally nice to people who tinker with their printers and sometimes even seems to be genuinely invested in seeing tinkering projects succeed.