Earlier quoted context omitted.
Hardwood is always covered in a plastic finish. Yes it feels different, but it is still plastic.
That's not correct. While many people choose polyurethane finished wood since it is less likely to stain from liquids, oils and varnishes are popular as well. See https://en.wikipedia.org/wiki/Wood_flooring#Finishing,_buffi...
Usually oils would be combined with some other varnish, especially on a floor, because they offer nearly zero abrasion or water resistance. You'd think oil finishes like boiled linseed oil or tung oil would offer some water protection because of the oil but they don't. Better than wax or nothing but much worse than varnishes.
This is a table from a book on my shelf by Bob Flexner on the subject, Understanding Wood Finishes. It's a good reference https://imgur.com/a/TzacsLs