I think Sets is still being developed, just not in the way originally intended. [1][2]
[1] https://www.thurrott.com/windows/windows-10/205364/is-micros...
[2] https://twitter.com/richturn_ms/status/1119646566782910464
[1] https://www.thurrott.com/windows/windows-10/205364/is-micros...
[2] https://twitter.com/richturn_ms/status/1119646566782910464
Didn't they say recently that Sets is not being developed, partly because it was too closely tied to non-Chromium Edge? Which makes me wonder how much else of that is still being developed.