I respectfully disagree. In other software, if I create a playlist it is stored as a separate file. (MC can import them)
Unfortunately, your recommendations assume everything is normal, what about disk crashes, or files that are damaged and a host of other problems that occur to all of us. Your big investment is the time to build your playlists. There isn't any apparent way to print your list from MC either.
One of the things I really like about MC is the fact that most things are also stored in the tags (lyrics, BPM, etc.). So if something happens to MC I still have the information in the tags. My investment of time to download lyrics is protected.
Bluntly, I have my wish list for MC too, but this is absolutely essential that the playlists be stored as a separate file. When you open your playlist it should show which files that are missing just like it does in the complete listing. I've lost a lot of work because I assumed that MC stored playlists like other software.
I didn't buy MC so I could connect to everything in the world. If I did, I would have bought a Panasonic, then I would get a toaster, boom box, can opener, that also slices and dices for you too. I simply want a great system that manages my music and protects my investment of time. If MC doesn't want to or can't provide it, fine, just say so.