I started way after pc graal and I still think more hearts would be a good thing.
I think most people can agree, the most fun types of spars are offensive spars. Defence is boring, more hearts would ensure more fun gameplay and people would probably stop walling as much.
If it was bumped up to 5.0 instead of 3.0, I doubt the time of spars would even change much. People would be more willing to rush as they have more health to spare.