Yes I know, that the answer of the question is clearly write down on github : "Flarum is currently in beta and should not be used in production".
But it's only for a non critical issue, little community, and I other platforms like Vanilla (so 2000 interface) or isotalk (not maintaned) and I'm not convinced...
I simply wonder to know if Flarum be used in this state ? What will you chosse at my place ?
Thank you !