Interesting, thanks!
I already have a nice home recording setup with a Fryette Power Station AND a Grossman Iso Box. With these combined I can crank a Plexi with hardly any sound in the room whasoever. I don't even have to go nuts with the attenuation on the Power Station. Just a little bit of attenuation and let the Iso Box take care of the rest. The Grossman iso cab works surprisingly well for bass too, to the point where it almost feels like it defies the laws of physics.

I actually get better guitar/bass recordings in my home studio now than in my proper recording studio.
A built in load box would be a LOT more convenient though, at least when I'm only recording the DI output, with no mic'ed cab.
But sometimes I want both and I can't see a way around the OTHER "problem" with the LB's DI output, that the tone controls affect the DI output. This isn't ideal if I want to combine a mic'ed signal with the DI signal. I definitely don't want the same eq on those. The solution is to eq the mic/DI separately downstream of course but still... It's always better to get things right at the source. That's the price I have to pay for that glorious DI out tone I guess. It definitely wouldn't sound the same if the DI output was pre-tone stack (and therefore also pre output tubes/transformer).