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
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.