It's not flawless. Sometimes switching to a big screen or moving USB devices between VMs is wonky... but the bottom line is I haven't booted my MacBook Pro for work in 2018. We stopped using MBPs because the then-current now one-minor-rev old generation is trash; all of them broke, and that was unacceptable, so I have a Lenovo (again).
Happy to answer questions about Qubes.
FWIW: not worried about Qubes' future. As Joanna herself points out in the blog post: Marek has been doing most of the technical day to day stuff for a while now, and Qubes has been doing just fine. I'm really thankful for the work Joanna has done in making Qubes happen and hope her new endeavors are everything she wants them to be :)