Every VW I’ve owned has rattled. It’s to be expected IMO. I’ve also been through the family and had a Seat Exeo, Leon Cupra R, and Leon FR, and a Skoda Octavia VRS, and they all rattled too. In the Leon FR I got so fed up I paid for full sound deadening and that made a huge difference.
I once had a brand new Golf MK5 which rattled in the engine bay as well as the interior, so the few rattles I can’t resolve in my MK7.5 is relatively decent.
Whilst I think it's that a lot of new cars maybe do rattle etc, I certainly don't think it is something we should come to accept (or consider acceptable) and expect... I mean, they do years of R&D on these things before they get released to market, and I don't think they deliberately go for the rattle as a free extra...
Having said that, it has to be the case that in any sample of similar models, some will and some will not... and maybe also the extent to which each of us is prepared to tolerate things is also a factor...
Personally, I think mine has way more "extra" noise than I would consider acceptable in a new car, and if other manufacturers can provide a noise free environment, then VW certainly can...
The question is whilst they are able to, do they want to...??
I guess it comes down to costs and to what degree they want to iron out any of these issues during R&D... Maybe not 100%... So, maybe the owners of new Mk 8's will find things they did not expect and VW can tweak design/construction later... But a 19 plate Mk7.5 is virtually end of model line and they have had 7 years or so to tweak things...
Just very disappointing considering VW would consider their Golf to be competing at the quality end of the market...