Yep. The thing can practically cause a nosebleed from the pressure wave. No way it’ll ever be anything more portable than a crew-served bipod/tripod weapon.
And titanium might be harder than steel, but it’s far more brittle too. Not sure they can make it GI-proof. An accidental drop here and there and you might end up with an expensive paperweight just when you need its firepower.
Our gunboats in Nam had .50 heavy barrels and were twin mounted. They were a pretty good handful to control. If they were 26 pounds lighter each I shudder to think what firing them would be like.