Another thing I do not like about Bluewallet is that it will not show the last thing you have done in the wallet. Like if you send bitcoin, it will not show it until you close the app and open it again.
That’s synchronization issue, you don’t necessarily need to go out of the wallet to get this done. You just go to the top of the wallet and drag it down to allow it to reload, it will immediately update everything.
The third thing is that the fee is not accurate, it is 1 sat/vbytes lower than mempool estimation.
I have also experienced this but it is actually not a problem because they use different estimators just like others have said. On most occasions they usually set the high priority fee higher than that on the mempool. I had paid 15sats/vbyte for transaction that could be confirmed fast for 9sats/vbyte. So what I do is to check the estimators and then customize my fees to my preferred rate.
One thing I would like the app on IOS to address is whenever you exit the app it should request for a password to login again even though it is immediately you exit. Most at times if you exit immediately you can get back into the wallet freely without it requesting a password.