Some people like the convenience of a single application that saves your settings and backs your saves up to the cloud instead of many different ones you have to micromanage, especially across different machines
Alternatively you can set that save backup up yourself with use of your favorite cloud application and symlinks.
My package manager doesn't have a nice controller-support UI
My package manager doesn't let me set up controller mappings
I'm very confused why people these days are so happy letting one big company manage their entire library and history. Did we not learn from the 2010's?