For such a young house, I think you shouldn't worry too much or try to remodel already to your exacting standards. Not the same but similar is auto repairs. Some people wait until something breaks and some people research and ask and do preventative part changes. Although I am the latter:smile:, sometimes I wonder how much good I'm doing with part changes. But I wish I had changed the power steering pump because now I'm one car less, and both the parents and kids are demanding rides. As the saying goes, when it rains, it pours.
If the attic was partially finished, and removing that work and doing it again makes you happier, then fine. But if demolition hasn't started, and this is something I learned to force myself to do, step back, take a breath and rethink the necessity.
As for the resale value of evidence, it depends on the whole picture, neighborhood, street, how close to school, transportation, the usual factors. If a certain buyer is picky, that means just be wary of them. If a buyer brings up issues during closing process, example, means you can consider very low discounts which is not really that bad. I think most people are smart enough or maybe ignorant enough, to not become problems. Lack of inspection is not your fault or responsibility and sounds like the area problem, maybe, so something like that becomes a general issue and not your problem. The realtor or the local lawyer will have explanation for those, and don't let the buyer or anybody else make it into your problem. Realtor, yours or the buyers, example, may use such reasoning to influence the estimates, and as you say, everybody is in similar boats, so don't be swept into taking personal responsibility for the area's problems.