I agree this is a major issue but we shouldn't get hung up on the Maserati don't design or build things right thing. VW, who have an R&D budget greater than some state GDPs get things wrong too. Dieselgate was a blinder and in 2015 alone the Golf had 4 safety recalls, one which rather alarmingly says “directional control may be compromised†and was related to having soft wheel bearing housings. And given the sheer number of Golfs this is, statistically at least, of much greater concern.
For me the issue is their closed attitude to communication and resolution, but even that is born from necessity, with limited resources in the dealer network. A brief look at the DVSA website suggests they are at least trying to put through recalls even for some fairly innocuous stuff. To add a bit of colour, I have included some of the recalls for Aston's over the years.
None of this excuses the way Maserati are treating Craig's client for the supply of parts, but I can also see their concern. If a new design of strut tower is supplied and fitted outside of their control (whether they sub-contract it or not) and then fails for any reason at all, they would then have to investigate that to ensure they have resolved the issue and maybe to defend a lawsuit - no doubt at huge cost.
Additionally, if I ran an independent garage and was asked to replace a dodgy strut tower that was riveted and bonded by a proprietary system and might need a jig for correct alignment, I would be asking my insurers if I was fully covered more than once. I'm not saying it wouldn't be done right, but if there was a problem, would I want the hassle?