In 2019, I joined a project with other 2 partners to develop an app for audiobooks. The CTO said the app should be done using Flutter and he sold it like it was paradise on earth. I disagreed but couldn't push that much to try to convince the rest of the guys about this detail.
On month 8 on the project, the CTO resigns and leave, leaving us 8 months ahead of no major development because it was impossible to find Flutter people and, most importantly, people who were proficient on that platform. In the end we relied on an agency, paying a huge price to do upgrades.
Nowadays I am doing a RN project and the speed, results still put that over any option I could do. I would only pick Flutter once it reaches a degree of maturity in all terms like RN.