It's been me who added this. The section "External workbenches", with 13 (yet empty) other add-on WBs has been already there, so I thought it was exactly intended for this kind of stuff. In the v0.19 release notes the section was called "Additional modules" and had an appropriate disclaimer.
I think such a section is valuable for the user, so I'd vote to keep it. We had it in the release notes for 0.19, 0.18, 0.17, 0.16 and 0.15, too. However, the intro text from the 0.19 page would be good to have on the 0.20 page. Any objections, if I copy it over?