I would guess it's because there was a long time between updates while the material re-design was happening where it stagnated. Then when the re-design finally

I would guess it's because there was a long time between updates while the material re-design was happening where it stagnated. Then when the re-design finally dropped many features still needed re-implimenting and many bugs needing squashing. It's been a rough few years for the project because so much needed re-doing but they have come out the other end quite well