You can count John Grimek among the many great strength stars who were also expert handbalancers. There were periods of time in his life when Grimek didn’t have access to barbells and dumbbells and regular handbalancing practice allowed him to still get in a great workout just about anywhere.
Handbalancing is certainly a worthwhile skill to practice for every strength athlete. The increased shoulder stability helps build pressing power. You sure won’t find a handbalancer who isn’t impressive in either strength or muscular development.