I have an OG EVO with limited storage, so I do have a lot of app moved to my SD Card.
However, if I had larger internal storage, all of my apps would be on the internal storage. Even then, I would want a SD card to keep my picture, video, music on. If all of it was on the internal storage, and I had to do a Factory Reset, it all would get wipped out.
And, no, I do not sync my phone with my computer. The last time I tried that with a Blackberry several years ago, it completely screwed up my Blackberry. It took me weeks to recover the correct setting.
Honestly, I do not want to go through that again.
"No matter where you go, there you are!"