That is sort of true. With the low end Chinese cameras, one of the big problems is quality control. So, in the past I've purchased several of the same camera at the same time and had many fail in the warranty period and then had the replacement camera fail in a few months of operation. I've had a few that lasted 4 or 5 years.
We ask a lot of a trail camera including operating in all kinds of weather conditions. One of the big differences in my high end BEC Orions is that they have the electronics coated and the low end cameras don't. No matter what precautions we take with desiccant or whatever, moisture always gets inside the housing when we open the camera to change batteries. Moisture may not be water, but simply air with moisture suspended in it. As cameras go through heating and cooling cycles in the field, that moisture vaporizes, moves through the camera, and condenses. Uncoated electronics degrade over time and then fail. So from this perspective you are right. While looking at individual low end cameras guys can have completely different experiences with the same model camera, if you look at the average lifespan the high end cams last much longer.
I'm still waiting for my first BEC to fail. I've had the Lexan lens and flash covers replaced along with a few connectors that wore out from use, but other than that they are all still going strong.
Thanks,
Jack