What people buy is what works for them regardless of what our needs our. If people did not buy trailers without slides they would not be built. I would never dream of taking my 35' 2 slide TT into the woods and tight trails, but it works great for the seasonal site with 3 Collies. Likewise I would not want to fulltime in my 17' TT with 3 Collies, each has a purpose.
I bought a used Wildwood 26bhss TT for guests at my seasonal site with a 12' super slide that did leak. I will fix it (new floor in slide) because the way it was built. IT wicked water from the bottom.