Up to this summer I'd have agreed with you, and was contemplating recreating a back-line like I used to have in the 80's and 90's bi-amped, 6x10 or 8x10 and maybe a 2x10+hy for the top... heavy, big and rock n roll...
Then I stumbled across Alex at barefaced...
The Big Twin IS a legitimate replacement for massive back-line, as is (I suspect) the Super 15 or the 69 or even the modular multi-boxes he does.
I'm also certain that similar light, very rigid multi-speaker boxes from BFM or fEARful will do the job. Cab, driver and amp design has come on some way in 20 years it seems.
I have no hesitation in recommending these cabs, go check them out.