Guess I do not know why a quality tool should not last a lifetime if it is used properly. I got my first set of 1/2' drive Craftsman sockets 60 years ago. They have been to countless SCCA and NHRA tracks, built and rebuilt hundreds of automotive engines & marine diesels; done endless maintenance, repair tasks on all my personal vehicles and spent the last 25 years on our farm being used on everything from a JD 318 garden tractor to one of our current 9R JD's; plus a few combines, wagons and other farm stuff. I have had two returns in all that time. One for a 10" 1/2" drive extension with that 'graceful slimline shaft' that twisted like a pretzel on a 440 ci Dodge main bearing cap (no cheater bar involved); the replacement in 1972 was an 'improved' model with a full diameter shaft. The other was a 1/4" drive ratchet handle that in 1984 simply gave up. Sears replaced the ratchet and since I was then in Alaska, the counter guy gave me an extra repair kit 'just in case'. That repair kit is still in its original box. I have never had a cracked Craftsman socket nor have my sockets flaked or lost any chrome. Then again, I know the difference between a hammer and a socket - and never have the two met. And with this post I have probably jinxed myself.
I'm not saying it's an epidemic problem or that I've had dozens of them fail but I just don't see how you can keep it entire set if it was your main set you used frequently and not have a socket crack eventually or some plating come off around the tip from constantly putting it on and off of bolts etc.
I think it also probably matters what our definition of frequent use is.
I have some sockets in my set that may have never been on a fastener.
I have others that get used every time I open the drawer.
I used to use my tools like this at least two maybe three times a week for just personal use.
Since I opened a repair shop years ago, I use certain tools almost 7 days a week. Yes, there are weeks where I work on at least something every single day of the week.
Now since I specialize in certain types of mowers, the tools I do use are quite a small number and very limited so those particular sockets get a whole lot of use.
It is common knowledge in the aircraft maintenance world also that they checked their tools frequently if not all the time.
They also use high-end quality brand name tools.
If a piece of chroming etc starts to flake or it gets a sharp edge or anything else the tool is to be immediately discarded and replaced.
I'm not in this field and I don't know for certain but this is what I've been told by several people.
So it would see him even high quality tools can have a failure or an issue even if it's not super common.
Also, just normal use is going to eventually cause a socket to slip out of one's hand and fall often onto a cement floor or fall while using often glancing off of or hitting iron or steel when it hits.
This is not ideal for the tool and could start a possible flaking issue even though it's not negligence or abuse.