Here's a huge misconception about Apple Music. Let me share my story:
I use the cloud for everything:
Music = Apple Music
Photos = Google Photos
Documents = iWork
Realizing this, I decided to "test" getting a 16GB iPhone 6s Plus. I'm on a leasing program with T-Mobile that lets me trade in my phone whenever I want to get a new one (almost whenever I want

). I figured if 16GB wasn't enough for my needs, I'd return the phone and pay $100 down to get the 64GB version.
To my surprise I was about of space within a month. I was shooting a video while on vacation and I ran out of storage space. I was so confused because I didn't install any games, and only had a one and a half pages of apps, none of which were more than 300mb. I wrote it off as the 16GB simply had little space to work with.
One day I realized there was no way my phone was using that much storage space. I started to investigate and couldn't figure it out. I called Apple Support.
Within minutes, we were able to diagnose the problem.....Apple Music. Apple Music takes up your ENTIRE phone's available storage. I had 7GB of Apple Music cache files. Not one megabyte could be traced back to Apple Music, without the help of technical support. The reason I purchased the 16GB iPhone was so that I could stream my music and photos without using local space. What a crock! The space comes through as "Other" in iTunes when providing storage information. On my iPhone? There was no way to tell. I was literally left guessing. Luckily, you can turn off "iCloud Music Library" and turn it back on to reset the cache. That's not a very elegant solution. I have a few things that I take away from this....
#1 - Apple needs to do a better job telling its users what is taking up storage space on their phones. The current page that shows your usage is laughable. "Other" needs to be present, otherwise it's a mystery.
#2 - Apple needs to let users limit the amount of cache Apple Music allows for streaming. There is no WAY I would ever let Apple Music take up 7GB of storage on a 16GB (12GB) device. That's lunacy.
I think it's shameful what Apple is doing. If I wasn't part of T-Mobile's program, I would be stuck with this 16GB brick forever. Luckily, I can trade-up to the new phone upon release to solve my storage woes. It could be worse having to reset my Apple Music cache every month, but I can survive until the new phone comes out....