You know with opinions, everybody has one....
Haveing had some experience w/larger BH's as well as on my small BX23, I can see where Kubota made the decision not to add the factory BH option to their cabbed B3030 tractors.
To me it all has to do accessability and efficiency.
I like the room and operation of the large Case I operated, you just simply spin the seat around without moving off the seat and you're pointed backwards to operate the BH. No getting up to spin the seat or getting off of the drivers seat nor exiting the tractor station then climbing down and then up into the BH station. Just set it and forget it
W/the cabbed B3030 and an add-on BH, the first dig will be most comfortable and pleasurable but, it's the necessity of having to manuver around to complete the dig is where the problem arrises as I see it. To reposition you have to get down from the BH, open and enter the cab, reposition, get down and out of the cab then climb up and into the BH seat then lower the stabilizers etc,. I know in my case this would get VERY old with all the timeconsuming and very inefficient repositoning of both me and the tractor.
I've already modified my BX23 so I can drive it forward or in reverse whilst pointed backward facing the BH so I KNOW it would get very old to me to have to exit in/out of a cab from/to the BH just to manuver around. And w/the distance the either BH sits from the tractors controls this type of modification to the cabbed B3030 would be a taxing modification to say the least, if it is at all possible in the 1st place.
Course thats JMHO ;D