I've attempted to use fleet quite a bit, but gave up on it currently because the latest versions simply do an infuriating infinite loop of indexing and gradle builds for me. Unfortunately I'm back stuck in appcode balancing an XCode / OS version way past the support range of app code and having to use XCode to run on devices because app code won't detect devices.
I can't wait till jetbrains focuses on one tool long enough to get multiplatform mobile development stable. It will get there and its no doubt a complex balancing act, but developing an entirely new IDE and getting KMP support right are probably not two challenges I would take on at the same time regardless of team size. That said, it is all coming together and I absolutely respect the size of the challenge jetbrains is taking on with their fantastic team.