Trying to push Rust code into Linux and after a year calling it a "failure of leadership" when people are reluctant don't welcome your code with open arms is not very professional. It has taken other projects decades of out-of-tree maintenance until their code finally got in (RTLinux).

The correct way would have been to maintain the Rust code out-of-tree, for as long as it would take, which would also somewhat prove that you are ready to maintain that code over a longer time period.

Sad that this led to him stepping down, but maybe others in the Asahi Linux circle are ready to keep maintaining the code out-of-tree until everyone is ready for it