You are talking about the
Deals listing/page when sorting for 4K, right?
When
I think of "Deals," I don't want to see the "whole list" of 4K titles available. I prefer to see a curated list of the newest deals, those titles with the largest price drops, or those who have approached (or met) their all-time lows....Which I believe is the intent of this site.
If I want to see
every 4K title ever released sorted by price, I do what you say, and do a search based on the vendor. Be aware, however, that the fact a price may seem low to you does not mean you are getting a "deal."
I may be wrong on how I'm interpreting your post, but that's my $0.02.