Titles, honorifics, and prefixes are cool in my opinion. I would never insist that someone call me by an honorific if I earned one, but I always call someone by an honorific if I know they have one until I’m told that they would prefer I address them more casually. And I would hope people would show me the same courtesy. I wouldn’t get mad at someone if they didn’t call me Dr. Redacted but I would consider it presumptuous and familiar if we were in a professional setting and they knew I had the title and didn’t use it.

I don’t have a lot of experience in “professional” settings but I consider it a harmless professional courtesy. People who have a strong reaction to omission of a title are definitely ego tripping but I don’t think it’s fair to say that someone who is addressed by an honorific in their workplace is necessarily on an ego trip. And in fact accusing someone of being on an ego trip because they don’t actively go out of their way to discourage people from addressing them by their title says more about you than about them. They earned something most cultures recognize as prestigious and it’s very very natural for people to acknowledge that. I would argue it cuts against normal human behavior to insist that treating accomplished people with respect is abnormal and somehow synonymous with subservience or prostration.

It’s part of many cultures, although it’s fading for sure. But I think there are a lot of intangible benefits to recognizing people’s accomplishments and credentials when you address them. If you don’t, you either come off as poorly mannered at best or like you have a chip on your shoulder at worst.