People move house all the time, changing circumstances, new jobs, family break ups, coming into a chunk of money etc etc.I'd be questioning why anyone would be selling a house after a couple of years. There might be valid reasons, but it would put me off.
The house next door to ours was put on the market just over 2 years after they moved in, Scottish couple moving back to Scotland, nothing sinister that I'm aware of. Probably get a lot more for their money up there, pandemic meaning spending more time at home, might want to be nearer family and friends etc. Although they were the second owners, not original owners.
Another property a couple of doors down was sold 2.5 years after it was built, again no major issue I'm aware of.
I was kind of surprised to see new build houses getting sold on so quickly but I guess it's worth considering that they often won't be a 'forever' home, perhaps a stepping stone house that people could afford due to the various schemes available etc.
I know where you're coming from though in terms of worries about build quality etc, but I guess no house purchase is risk free and you can arrange surveys to indemnify against serious issues.
With snagging I guess it depends on how fussy previous owners are, for example we did some snagging but weren't super fussy, an example is in one of the showers the tile orientation wasn't right, we'd asked for them to be at 90 degree rotation compared to how they were installed. It was one of those situations where we couldn't be bothered with the hassle of having it all ripped up and retiled for what was a minor cosmetic issue that probably only we would care about (pattern orientation) and wouldn't be visible to visitors. It's the sort of thing that if you were being a used house you would just accept as the way it was tiled and think no more about it rather than something that warranted being changed in the way you might do carpets, wallpaper etc.
As for value personally I'm not completely sold on a nearly-new house, you end up paying the premium for new build but without having everything exactly to your tastes (one of the advantages of a new build), the snagging period has typically expired too although you would benefit from NHBC up to 10 years. On the plus side it usually means the major snags have been addressed already, together with utility supply getting sorted out, address being on databases for ordering stuff etc.
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Since we're sticking to stereotypes, you live in Scotland so you must like fried haggis and Irn Bru, right? Or perhaps accept that not all new-build estates are the same and the OP is looking at a new-build that is around 3 years old so he can see exactly what he's getting with parking and crowding and the likes.