Mixed pages ask you to sort too much
A mixed page helps when you are still exploring, but it can also make you scan items you have already ruled out.
Browsing help
Why category pages often feel easier than mixed pages.
When you already know what you want, a focused page is easier to use. It removes extra choices and helps you get to the next click more quickly.
A simpler page feels calmer to browse.
Category pages match what you already had in mind
If you came in looking for shoes, bags or jackets, landing on that exact section feels more direct and less distracting.
How this site uses that idea
The homepage gives you a simple starting point, then the narrower pages take over once you know what you want to open.