Way more accessible to someone with limited tools and knowledge. A guy with hand tools and a few friends can swap a cab in a weekend if they want to.
Not only that, but that rust is in places that are somewhere between very difficult and almost impossible to fix properly. While different ball game when the upper cab/ big pinch weld seams are rusted through.
Pretty much a deal breaker or certainly way harder than finding a decent cab.
Rockers, floor pans, cab corners different story.
I had several rust thru spots around the windshield and back window frame (zero rot elsewhere, anywhere, strange). I laid into the first one drilled welds and cut patch piece out of scrap cab parts.
By the time I got done salvaging the patch I had hours into it and hadn’t started the same on the truck.
I was fortunate that the rust came from the outside so rust thru was limited to small visible spots and no hidden cancer inside. Some I cut out and patched, some were small enough to booger weld shut and some became additional drain holes along the bottom of the windshield frame.
If it looked like the OPs truck, I’d have scrapped the cab.