Can you explain what do you mean exactly?
If you mean compression to reduce it's size, it's handled by gzip since beginning.
If you mean minification, either it can be handled by WordPress for third party assets or developer themselves by using proper dev workflow e.g. gulp/grunt.
If you mean both then there is not significant benefit worth spending time on pagespeed.
You may read - https://css-tricks.com/the-difference-between-minification-and-gzipping/
If you mean something else, please elaborate.
The impact of this is reduced by http/2.
I am reading more on the topic but in any case, we wont be adding pagespeed back.