what was their reason? lack of stroke or placing them outside their sweet spot? "under no circumstances" seems a bit extreme!
KONI adjustables should not be viewed as a 'too hard' option. adjustment is very easy, and you don't have to be an engineer to make the adjustments. granted, you (and i) may not feel a difference with a very small adjustment (eg: 1/8 turn of the adjustment dial), but i find it's easy to feel a difference with at least a 1/4 turn. so i generally only make incremental changes using at least 1/4 turns, but usually 1/3 (120 degrees) turns.
it is suggested that the KONI adjustables be used at the 'softest' setting if you wish to have ride comfort similar to the factory originals. but i've found (on several of my cars) that i prefer at least 1/2 turn away from softest towards hardest. usually around 1/2 to 3/4 of a turn, for front and rear. note, there is around 2-1/2 full turns from softest to hardest, so plenty of scope to tune to your liking.
i have Bilstein B6 dampers to fit on my 155, but yet to happen. will hopefully have them fitted in a couple weeks when i have days off from work. these too suit standard springs, and up to 30mm lowering. otherwise, you should use the B8 short-stroke versions. i will be using Eibach springs, quoted at around 30mm lowering, so i chose the B6. advice from alfisti.net shop, where i bought them from, did not suggest otherwise.
btw, i've heard that KONI FSD build quality is nothing special, and the design is also nothing special. in that, for the premium over the adjustable Sport models, they are not good value. from memory, this was secondhand info, originating from a suspension specialist who had cracked them open, and fitted them to several cars.