I used to do loads of these , horrid one piece bodywork that you had to flex off (

) nightmare to work on and set up for a smooth race track so would have non existent suspension . One of those great let downs in life I’m afraid.
As an owner of YB6 and YB8, I can confirm all of this!
But like all things Italian and beautiful, the pain can be alleviated with familiarity and care (mixed with just the right amount of malice).
The fairing is a MASSIVE pain in the arse, but you can do most things on the bike without removing it, most things with fuel, carbs etc is easily reached with seat/tank unit removed and even oil changes can be done with the fairing just dropped forward. Actually removing the fairing is indeed an excruciating experience, it's easiest done by removing the front wheel and forks first (but you need to remove the fairing to reach the fork bolts...). I made a sort of an I-beam shaped front wheel stool and lift the front of the bike with a race stand and place the front wheel on that, and then the fairing needs a lot less flexing to get past the front wheel. Extremely painful, and a 3-piece fairing modification is high on my wish list. They were never designed to be practical.
Hard to work on - absolutely! Everything is so closely packaged, but again the pain adds to the charm in a sort of a Stockholm-syndrome kind of way. My favourite oddity was that to remove the LH handlebar I had to remove seat unit, fuel tank, airbox, ignition coils & carburettors! Bimotas have always been like that, Dad had a DB1 in the 90's and to check the valve clearance you had to remove bellypan, nosecone, body unit, fuel tank, oil cooler, battery carrier, rear shock and left hand footpeg plate.
Suspension, yep. I've had mine totally respuing/damped and it's great now. But in fairness all old bikes are much the same.
So yeah, they're painful but every so often you get a day and a road and you hit a sweet spot and they work like nothing else on the planet (of the period). They're hard to work on because they're packaged tightly, but in comparison to a contemporary FZR1000 it feels like a 250 on the road. And as an engineerey sort of person and former machinist, I just love the artistry that has gone into the production of every single little piece, just beautiful. Good jiggers, very Italian despite the Jap engine.
By the way although the YB11 Marty had in the shop shares much the same engine and frame as all the YB4/6/8/10 since 1984, they had at least given it a multi-piece fairing. Makes that part easier at least!