The woodshop at the Arizona RV resort I winter at has a DeWalt that someone has added a spring contraption to lift the arm.
I've found it annoying for it to pop up when releasing a blade and tough to hold it down to reinstall. Maybe it's sprung too heavily or I didn't give it enough time before moving to another saw.
On a related note, they have a couple new Delta saws. They have a button to push in the hold the arm up. However, the button is at the back and is a stretch to reach. Additionally, it allows the arm to come back down far enough to be useless.
Couldn't wait to get back to my saw.