[SkyPuncher]

"Being used in production by Google" is a poor quality measure for most companies/people.

Google, and similarly large companies, have an entire infrastructure and internal community built around supporting tech stacks. If/When developers hit bugs or limitations, Google has the resources to address it. They can literally assign an entire team to improve a single performance aspect of Flutter or build any missing functionality (much of which is going to stay internal to Google).

Outside developers don't have that ability or bandwidth. They can't afford to stop feature development for days or weeks to figure out quirks/improve Flutter. They're almost 100% reliant on public feature set and community support.

From a pure tech POV, Flutter seems like a better technology approach. However, there have been plenty of "technologically better" frameworks that have failed because the general community does not support them.