I've worked for a short time with two vets who would show opposite ends of this argument.
The first was really old. He couldn't bend to reach patients anymore, so there always had to be a tech to help handle animals for exams. He had a bit more trouble with eye sight, so he used extra magnification when he looked at anything smaller than a quarter. But he kept up to date on his CE, and asked questions of the younger doctors about what was changing. He admitted to the faults he had and managed as best he could and asked for help when necessary. He only worked very part time, and did not do surgery anymore, but he had started the clinic and liked to feel like he was still part of it. The schedulers tried to be careful not to schedule him for surgical consults or anything that he would have to follow closely long term. If he got something that was outside his comfort, he referred people to the other vets. So he worked with self imposed limitations and did a great job of customer service and what looked like excellent care within the typical clinic standards.
The second vet was about 60. Said he would retire if he could afford it, but since he couldn't, he would just keep going. He no longer felt comfortable in surgery but instead of turning them away, he would accept soft tissue stuff and schedule them for 6 hour blocks. He often spent the first 2-3 hours of the animal being under anesthesia, running out to pick things from the yard, or go make a "quick phone call." The quotes he gave would be adjusted for a 5 hour spay, and he would get mad at customers who questioned why. He barely kept up on CE hours, mainly by attending local meetings and instead of attending any seminars, he would hang out near the food and booze and talk to the reps or the catering crew. As a result, he was way out of date with current care and treatment options and recommended euthanasia as the best choice for anything that required long term care or management rather than referral. If questioned by a new associate doctor, he often would joke about how he had never been a good student and "just barely graduated vet school" and then fire them a week later and spread rumors about incompetency. If a client questioned him, he used the same joke and then refused to see them again. His office manager was his long time girlfriend and would beg people to alternately stroke his ego and subtly hint that it was time to retire. He had issues with depression, paranoia, and occasionally threatened murder/suicide ideas.
Of those 2, I kinda wished someone would check on the second, though he had to be about 30 years younger than the first. Working with the second did make me wish there was a way to have someone check on him, especially because I heard so much concern from his peers, but nobody did anything because, how else was he going to make money to live and pay off his debt from buying the clinic?
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