I often make large bore rifles. I have made eighteen 8 bores, six 4 bores, and one 2 bore sporting rifle. weights from 13-22 pounds . So making and dealing with heavy guns is nothing new to me. In fact, the making of these big guns is the very reason I personally see no reason I'd ever make one or buy one over 11 pounds for my own use. If others want heavier guns that's OK. I will make one for them. Or direct them to others for sale I didn't make.

But I never will leave the USA again (I am pretty sure) and I have no animal over about 2300 pounds that will be in my future to hunt. My 375H&H is all I ever need on ANY animal and my 404 is more than I really need. My 62 cal flintlock is also all the muzzleloader I can ask for, to be used on any north American game animal.
I may make myself a 12 bore just for the fun of it, but it's also going to come in at about 11 or maybe 11.5 pounds, but in all likelihood I'll make it and just sell it.

I am making myself a 9.3X62 in the near future. I will get it down to about 9 pounds with the scope, strap and fully loaded. I am not one that worships the guns of 5 pounds, and I see no real virtue in such light weights, especially considering what they cost compared to what "advantage" they really offer.
But I see nothing over 11 pounds that offers me any advantage either.

Just my preferences