No moisture wrap, no redguard needed.

I even got gentle - not pushy - follow up calls as I was having my first (very old) home inspected as required by the underwriter. 

If it localize, i.e. a roof leak in a certain area, a wall in a basement that have moisture coming through.

That could be a moisture issue as well.

One home with a dog hadn't changed their filters during the winter; the unit worked harder and actually had moisture in the return because of the temperature differences. 

Read your contract through, as many standard contracts do have built-in protections that if termite/moisture or lender-required repairs are found, seller agrees to cover up to x% (and it usually states, if no number entered, parties agree to 1% of purchase price). 

I have put in a gently used coil top range in before a couple of time (because they last forever and fairly easy to move and install) but with a refrigerator or washer or dryer or dishwasher, I just get a new one. 

-If you have to cut the walls be super gentle not to loosen the plaster you’re leaving, or turn into something much bigger.

Now they've decided to go to this Coretec product at $3.2/sqft that supposedly is fully waterproof, needs no moisture barrier, can go in kitchens and bathrooms, floating floor no glue required.

Older home have the potential for higher repair costs due to outdated electrical, plumbing, etc, but as long as there's no moisture issues these houses were built 10x better than today's houses.