Fleet has been a multi-year effort, gotta applaud JetBrains for willingly take the bet and continuously investing in developing its products. It's way easier to rest on their laurels and only provide maintenance updates to IntelliJ.
I particularly disliked Fleet. It resembles VsCode in looks, and that’s a very bad thing for me. No sense of hierarchy, of what matters, of what tools I actually want to see and where they should be.
But then I’d say the same for Apple and its software.