They were opposed to C++ (they thought C was all you need), opposed to git (they used IBM clearcase or subversion), opposed to putting internal tools in a web browser (why not use Qt and install the tool), opposed to using python or javascript for web services (it's just a script kiddie language), opposed to sublime text/pycharm/vscode (IDEs are for people who don't know how to use a CLI).
I have encountered it over and over, and each time these people get stuck in late career jobs making less than 1/3 of what most 23 year old SWEs I know are making.
But then hindsight is 20/20.
My most successful "this is doomed to fail" grouchiness was social media games (like Farmville).
But I just can't think of any examples in the dev tooling space.
You can rightly avoid new things 99% of the time, but if you miss the 1% of things that matter, you get left behind.
On the other hand if you adopt the latest thing 100% of the time and 99% of those things are a waste, you will probably be fine.
But if you expect to get paid, you need to keep up and stay productive.
And it doesn't burn everyone out. All of the best 50+ year old engineers I know use LLMs constantly.