ALAC is not an appropriate substitute or direct replacement for FLAC, so no, I will not just convert my files. Rather, I will continue to ask why Apple is the only one with trouble supporting a widespread industry standard audio file format no other developer seems to have a problem with.
And as for the USB 3 speeds, I used the appropriate cable - the current version of iTunes as of the iPhone 15 Pro’s release absolutely did not transfer data at anything even slightly faster than USB 2.0’s speed of 480mbps