Docker is a prime example. It's supposedly easier to spin up a docker container for a basic web server stack, but to be honest I'd rather install PHP/MySQL and an SSL certificate manually, rather than spend time finding a decent container from a trustworthy source, and then spend 20 minutes trying to figure out how and why it's been configured the way it has, etc. etc.
Plus there's the need to actually install docker itself and learn how to use it in the first place.
Every one of these comes with its own learning curve which isn't always better than just learning how the actual tools underneath work.