Is it the ultimate private, secure, permissionless, censoship resistamce messenger?
Or is there still some weak spots and compromises?

How does it compare to Briar. 

 https://simplex.chat/blog/images/20240314-comparison.jpg
https://simplex.chat/blog/20240314-simplex-chat-v5-6-quantum-resistance-signal-double-ratchet-algorithm for context of the yellow check marks 

 I don't most of these lines and I'm not sure it's the most objective comparison, but still interesting.