And here we go again with the attempt to frame the problems (yes, they are problems) of bumbsteer introduced in the latter ones, as "vintage charm". I'm sorry, but the front suspension was designed better, but they chose to downgrade it to a worse. I don't need the "charm" of chain either, as the thing is belt driven, I don't need to sit in castor oil fumes either, and as it happens, it has a modern gearbox, a modern engine, a modern bevel box, and it was designed to have a modern suspension.
The bumpsteer was introduced, and on some it worse than others. The bevel box - a modern design by one of the industry leaders is whining a lot in some of them, and need I remind that at least Martyn who is the owner of a real vintage threewheeler says he doesn't suffer from bumpsteer? Seriously, there is nothing "vintage" about the design of the threewheeler, other than it is "retro". It was never designed with an old-school suspension, it was designed in CAD, with a modern suspension.
As for the bevel box, well, that too is a modern design, and with modern CNC machines, it shouldn't have to whine either. And since Morgan has something resembling a replacement service, they are at least realising that that is not how it's supposed to be. Ever heard a vintage threewheeler or four wheeler whine as much as some of the 5-speeder threewheelers out there? I haven't. Well at least not on a vehicle that wasn't very close to breaking down.
You're framing it so that people should accept subpar quality, simply because the vehicles in question is retro in style.