I too am waiting for the 25k limit to be lifted. And I also have a carefully curated library.I have a vacation which I was looking forward to taking my 400gb music collection with. Then again do I really want to open such a large collection on a IOS device? It always use to lag so much with just 200gb. plus the nightmare of itunes libraries losing their marbles with recent updates lately and connections with apple music / icloud.
My iTunes collection of many years in order is precious to me and I am tied to it in a way, I back up before updates as with apples track record with itunes is not good. I cringe after every redesign and update hoping it doesn't fall apart! being patient is key I guess.
Oh I defiantly know to wait after a release and to log onto forums to see the damage its caused to others . Take Apple music, I was hopeful but wary and the amount of the threads that cropped up of libraries of botching up, I did not want to risk it. I did turn it on after a backup, and it downloaded all my songs from my 2 devices, thus giving me 3 copies of every song and every playlist, I turned it off before it finished downloading them all. I actually enjoy and subscribe to Apple Music and have sussed how to sync to my IOS devices from my main library without turning Apple Music on my mac.I too am waiting for the 25k limit to be lifted. And I also have a carefully curated library.
I highly doubt -- even when the limit is lifted -- that the service will function as expected.
Take, for example, a matched song. Does it also store your metadata or does it discard and replace with that from the service? If so, total nonstarter for me as most basically, the existing genres are so uninformative. Sorry, that's a bit of a thread hijack.
Now back to waiting.