iPhone puts out bit perfect via USB (as far as Apple states).I don't use bluetooth, I use iphone 13 Pro Max with apple camera adapter usb to the K9 Pro.
There wouldn’t any benefit if you play the music from internal storage while shutting down all wireless systems (BT, Wifi, Cellular). Maybe using an OTG specialized for music transfer would be the icing on that cake.
However, the second your Phone has one wireless service running it is mpossible to foresee the implications. So if you know what you want to listen to, your phone has enough memory to store it and you can switch all wireless connections off, than you don’t need an m11+.
If you want to stream, you may notneed it also, as the benefit is indirect from other parameters like signal quality at the specifict spot of you device.
If you have only limited storage on your phone, the m11+ is cheaper than an iPhone with big storage.