I’d say wax issues are issues only if your ear produce some significant amounts.
Mine does not, so I got new wax guard on a new receiver (which just died in my ear, wax guard was still shiny). I also didn’t change dome for whole lifetime of that aid, that’s 4 years. I stopped cleaning it after few weeks. Would just every few months remove a bit of wax I see on the outside of the receiver box, with a paper towel. Aid is still working, I’ve just upgraded.
Have this new receivers for around 2.5 months, same domes, zero maintenance and still didn’t notice any residue from outside. Wax guards are also clean, my fitter checked last week.
And to make things worse, I sleep with earplugs, so ears really don’t have a lot of time to air out.
So, you can get wax-lucky also