Less an issue with 5 GHz, because drywall does a fairly effective job of blocking signal. Not entirely, but quite a lot. Which is why I have 4 mesh APs in our 1700 sqft house: One in each of the rooms where we use wireless most, and one in the middle.

We went from having spotty Internet to it being really solid. I think we have some neighbors that have devices that interfere with 2.4G (cordless phone? Microwave? Baby monitor?)