UX Reason why there aren’t any "Search for project" feature in portfolios?

I'm curious what is the UX reason of not including a "search for project" feature in portfolio websites?

I find most featured websites found in places like awwwards doesn't integrate a "search for project" feature, whereas in EC websites these are found on a regular basis.

What is the reason for this, and should you be integrating such features in portfolio websites?