When adding locations like cities or villages, in my opinion it should be ok to add a central point tagged e.g. as place=village name=… whenever I don’t know the (administrative) boundary of that location.
I followed this strategy when naming islands, too, because some other islands in the vicinity had been tagged this way, but thinking about it here it appears less logical to me as the boundary is actually known. So, should the place and name tags rather be added to the coastline polygon?
Another issue I’m not sure how to tag: really, really narrow streets (maybe 2 or 2.5 m in width with tight curves) that do not have barriers and are not signposted with any traffic restrictions, but likely unsuitable for a lot of vehicles. I would probably be best to tag it with est_width only?