It served its purpose. Back in 2009, iTunes on Windows was fantastic.
(and same continues today. My wife has recognized the sound coming from my office when, every few months , I try to copy photos from my work-mandated iPhone to my windows pc. It's a few hours of screaming, then I give up)
It's tricky. If they don't provide key software for Windows to work with their hardware devices, they'll be blamed for it and called an evil proprietary company (which, fair enough. Just let me plug it as USB storage if you want to avoid that particular reputation :).
On the other hand, if they make their crucial software on Windows half assed, some people like myself at least, will be wary of touching anything Apple with 10ft pole. It May be that working strictly in Apple ecosystem makes for better experience, but that's not my world so I'm not tempted to dip my toes in any more than I have to).
It was not. Though at least it did the job, which was rare enough (then again I’ve had to use sonicstage, now that was some bottom-tier irredeemable garbage).
I’m pretty sure iTunes was at its best when it was SoundJam and got worse every time it got touched afterwards, until Apple managed to declare software bankruptcy… and replace it by something worse than it’d ever been.