"...not being built to precise standards". I don't accept that at all, and I've owned about 6 XA cameras since my first in 1979. None of them came to fault, just a waxing-waning interest in photography before I fully pursued it.
The precision of engineering (especially the lens and meter control circuits) has been very well documented and tested over the decades.
A 20cm deviation!? Are you sure? 20mm might be more accurate. It looks like the parallax overlay has been jolted out of position (e.g. dropped).
XAs re fairly easy to service by technicians; the problem today is sourcing spare parts. The shutter button will last and last; how you treat it has a bearing on how long it serves you. People stabbing at the shutter button, or worse, using a fingernail, should expect early failure.