l/''xx'' templates

I know, but I don't want them to be removed/deprecated at the moment, but to remove that section that you added in l's docs which says "l/xx is strongly preferred".

I suppose if {{l}} is now faster than it is before, it is not as strongly preferred anymore.

Considering all this, do you agree that we should stop categorising every time someone uses {{l|xx|foo}} where {{l/xx}} exists?

Yes, but I think that has already changed with {{l}}'s code being completely replaced by a module. It just takes a while to empty out the category.