Not that I need to provide credentials to point out bad advice, but I've owned a high end detail company for the better part of 15 years (hence my forum name).
I will say, it does seem to be a party line between body guys and detail guys regarding proper practices for taking care of the paint. The body guys want to point out that the paint has enough protection and the prep is important (which it is, proper clay and polish routine is key to the wet paint look), the detail guys want to point out that proper defect/contaminate removal is key along with protecting the paint with a sealant or wax ( I prefer sealants).
In fact, going one step above are modern coatings and not waxes or sealants. Offering up to 12 month durability and exceptional protection they are quickly becoming the best option for people truly concerned about protecting paint.
Like another user said, I can provide plenty of picture evidence that a proper application of wax or sealant along with a clay and polish routine, is paramount to protecting the paint.
Bottom line, after your suggestion to clay and polish, a wax/sealant/coating needs to be applied to property finish the task. Leaving the surface bare is just asking for paint damage.