Given an under 70 inch TV (such as mine), I would certainly pursue repair to the backlight if those parts were widely available at a fair retail price. (Naturally, assuming I diagnosed that as the failure). I would willingly do the same for a friend who asked. It would cost less than $50 to do that.
I would be especially inclined to do repair rather than replacement on my TV because it took some shopping to find one lacking the "smart" features that are specifically un-desired. It's even harder to find that on offer now.
I did once have to replace a dishwasher because a cheap to make part was unavailable. Simple replacement would have been less of a PITA than replacement, but wasn't an option. It also would have been several hundred dollars cheaper.
As for washing machine, it's good that I was able to get a bootleg service manual for it, because the idiot the company sent to do the warranty repair didn't even know how to put it in diagnostic mode. Actually, he was the second repair person. I turned the first away because his van was un-marked, he had no ID, and he looked and smelled exactly like someone more interested in casing the joint than repair. He also mumbled so badly that I'm not sure he was even speaking English. Finally, the second guy went with my diagnosis based on error codes and replaced the part I wanted replaced. It's been fine for years since.