Why is that a concern? Could simply be a technical issue, cheaper to swap than repair, and then factory-refurbish the unit and re-sell it.
This forum has been valuable for making buying decisions in my short 6 months of reading. This almost seems similar to Computer industry and Apple, the built in obsolescence business model. Am I wrong? All Apple stuff worked great for 5-6 years but has broken, which I feel is crazy. Apple refused OS upgrades, so "just buy a new one" is b.s. I will repair and I figured work arounds, external keyboards, external boot hard drive to Linux, etc. Same with major label laptops, they force you to buy latest. Cameras I can't tear apart myself. I didn't think this 5 year lifespan ideology of not supporting products longer than 5 years was going to infect the camera market. Glad I didn't buy one of those R10 or R7's or M6mk2 refurbs, and a new M50 instead.
If you are in the USA, likely easy still to do swap. So up until 2004 I had nothing break or need repair, I had 25 computers and no Board or even HDD failures. But buying things since 2004, a different story as QC and MTBF seems to have shifted.
I now am not in the USA. Many things I buy in tech, name brand die in 5 years. So it is difficult to get service without major hassle of travel and parts are not stocked. No efficient shipping expensive things in country either. If no local repair parts support, not cost effective to send back and forth to USA and hassle with all import paperwork and shipping costs. I have been somewhat unlucky with Amazon sending the wrong stuff or defective stuff too, or things being stolen in transit, worse is high import and handling fees. But at least Amazon, they made it right.
Until reading here and watching videos, I wasn't aware of lens manufacturing inconsistencies, "getting a bad copy", no idea how true or how often but surprises me with CNC everything now. In my past I sold optical products and my OEM was very consistent in lenses and QC and I did my own QC before shipping to protect my customers. There is no try before you buy or rental where I am either, so I have rely on your input and others for tips, info, etc. All is appreciated.
So, I try and buy locally new (same price as USA and they import) and usually brand name stuff and this camera hobby is getting expensive and I am bothered by the M mount extinction. Several of you mentioned how much you like the M6mk2, and so thought about ordered it from Canon until I read what I did. Locally, the distributor sold out- no more M6 or 90D's and seem to favor MILC Sony products as the buying public in their sales volume.