I have seen other people have wished for linked keywords before. However, it seems the issue has been linked and closed in the respective github issue. The milestones for OJS3.2 say that you are planning on implementing browsing of keywords, but not actually the linking of the keywords as clickable tags.
For us this is a very important feature and I would like to suggest you include it again.
Readers and authors are used to having keywords that refer to a list other documents that use the same keywords. This feature would add significantly to the usability of the OJS frontend.