I think you'll find people with them like them, people without them think they're unnecessary. Hard to get an unbiased view.
For me, I think on the B2601 the drive over deck looks great. No fiddly ramps, and you still manually attach the driveshaft.
On the BX there are the ramps, people say they rattle, and it looks like a faff. The auto connect on the driveshaft sounds good in theory, but I find it hard to believe that I'd drive accurately enough for it to mate properly. Seems like something that'd be great when it works, and when it doesn't work it'd be three times as hard to connect because there are extra fiddly bits in the way.
I have a BX2350, which has had a hard time before I owned it. The wheels on the deck are bolted, so I never bother turning them. I just drop the deck, lift the front wheels with the loader, roll it out forwards, lift up the loader again to pull the deck the rest of the way out. I do it on the lawn. Main thing is that I have the scalp wheels set reasonably low/short so they don't drag when I mow the road verge. The pins that hold the mower on sometimes don't come down quite far enough, so you have to lift the deck a bit to make them engage. That's a real pain - literally, I hurt my back once doing that. On an 80 that wouldn't be a problem, the wheels adjust easily - just put the wheels down further to give more height. Or do what I do and put a board under it before taking it off.
The drive shaft attach is fiddly, but you get used to it and it goes quickly. Main thing is that it's basically impossible to do without lying on the ground. If you planned for that you have a mat to lie on. If you didn't you get dirty because who could be bothered going to get a mat when you're in the middle of taking the deck off.
I don't take my deck off often. The loader I take off when I mow, I only take the deck off to sharpen and when I'm doing loader work that needs more clearance - which isn't often.