That is absolutely false. I don’t know where you heard that, or what would lead you believe it was true.
The market spoke. Consumers didn’t want to have to spend anywhere from $300 to $1200 every 60k-110k miles to change a timing belt when a timing chain will typically last the life of the car.
I was a new/used/fleet salesman for a few years, and I still keep up with current trends in the industry. I can tell with unequivocal certainty that chain-driven overhead cam engines are just as reliable as anything else. If there were some kind of secret fatal flaw inherent to the design, the entire industry wouldn’t be using it for the majority of their engines.
If you’re buying used, then you’re at the mercy of whomever owned the vehicle previously. If the prior owner didn’t keep up with required maintenance then you’re going to be the one of the hook for it unfortunately. That’s not the fault of the engine design.
Your choices in vehicle will be dramatically reduced in that case
Just so we’re on the same page; You manged to stretch some chains on your chainsaw because you neglected to use the proper lubricant. And then somehow parlay that, along with the word of a used car salesman as definitive proof that overhead-cam engines with timing chains are all faulty designs and are incapable of going 150k miles without failing. That’s my takeaway from what you’ve posted on this subject thus far. To me that’s not a strong argument.
In that case you’re going to be limited to GM or FCA. Ford does have a new big-cube 7.3L gas engine coming out for their Super Duty trucks though.