I guess three things are a bit unusual to a piano compared to most instruments: dynamics, size (or "directivity"...?) and the actual "sound" of it of course.
On the last point, I often find the nature of piano can cause some mics & speakers difficulty with distortions. Not a problem for good/appropriate mics, but I suppose an iPhone will struggle.
So, yes IMHO, those three factors combined do mean it could be considered a bit tricky. But as with all things... If you're someone who has all the kit, a decent sounding room (allowing more freedom of mic positioning) and records piano all the time, it probably becomes rather easy I've only done a few myself, and not for my day job.
Don't know if anyone else has noticed this, but several times it's been piano that's alerted me to a failing driver (especially tweeters) before any other instrument. And it never survives lossy compressing very well to my ear.
On the last point, I often find the nature of piano can cause some mics & speakers difficulty with distortions. Not a problem for good/appropriate mics, but I suppose an iPhone will struggle.
So, yes IMHO, those three factors combined do mean it could be considered a bit tricky. But as with all things... If you're someone who has all the kit, a decent sounding room (allowing more freedom of mic positioning) and records piano all the time, it probably becomes rather easy I've only done a few myself, and not for my day job.
Don't know if anyone else has noticed this, but several times it's been piano that's alerted me to a failing driver (especially tweeters) before any other instrument. And it never survives lossy compressing very well to my ear.