Fair enough...I found the opposite.
Cabs add way more colour that I previously thought, every profile sounded so similar. I used the usual rock staple 4 x12 with V30's and GH12's but ran it with many different cabs with the same outcome.
The big advantage is its closer to FOH. With a cab, there is so much colour you don't know what you are sending to FOH direct. When I ran a cab I tried to go direct and it sounded really bad. I then got an FRFR, realized the profiles I had were pants, changed them and boom job done. Now I know what sound goes to the PA.
I also refused to spend £00's on one, I have the powered rack and bought an FRFR Camper for £120. I also have a wedge that I paid £180. Both sound pretty good.
Oh I would never design my live sound with my cab - unless I was playing live with my cab. I'm just saying it's the best way to play at home and sounds fantastic.
If I am playing live - I design my sound with my headphones or in ears and it translates perfectly. You can run that sound through a cab to kick you in the pant legs if you want - but I wouldn't expect it to translate very well - and there's also no need for it to if it's just for feel.