Add-on Updater 20.06.2 is on its way, to be released either today or tomorrow (likely later today). This release includes two major changes:
Regarding the second item: whenever all features from an add-on is included in NVDA, a notice like this will show up in the future. This can only occur if the author of the would-be legacy add-on informs the community that the add-on is no longer needed. The notice itself will be sent out a few months after legacy declaration takes place, likely around the time the successor NVDA version is in circulation.
For example, suppose NVDA 2020.3 includes all features from Resource Monitor add-on (hypothetically speaking). If that ever happens (unlikely), I will declare it as a legacy add-on around the time NVDA 2020.3 stable version comes out. A few months later (around the time NVDA 2020.4 shows up), I’ll include a notice in Add-on Updater saying that Resource Monitor should be removed.