I don't, nor do I ever intend to. It just isn't useful to me.
I would imagine, that cloud syncing of large images or music files would consume more battery than a live tile.
If WP wants to compete with Android, they should offer as much functionality as possible, whether some users would find use in these features or not.
I can't say enough how useless I find OneDrive to be, and it's still there. I can't get rid of it! How about making it optional, as well as a live tile for notifications - then everyone's happy??
Microsoft doesn't lack functionalities. It's actually better than Android in many areas. They are slow and confused in the way they have to make the whole thing work. I was happier with Windows Mobile 6.5 than i am with this sort of permanent Beta that lasted 4 years.
One Drive: It keeps refusing to upload files with names after a certain lenght. I need to save thousands of articles and share them on two laptops; i need to save translation memories for my jobs as i share them between translation software on two PCs. It works good sometimes, other times doesn't sync. But i don't complain much about it. The major issue about US made OS and Cloud services is that your stuff goes in just anybody's hands. So for serious clouding i go for EU services, more expensive but much safer; for browsing i go for alternative solutions (firefox on a rooted android with TOR, set as default browser and DuckDuckGo as standard search. Nothing of this can be done on WP.
Therefore, one can't come up with the idea that people don't like WP out of the fact it's not fashionable. My 1520 costs 700 euros and me and my partner exchanged gifts (we bought two, not one). We both need it for work and none of us is happy. We're mid 40s, so games and "fashionable social networks" (i don't have FB, no Twitter, no social, don't use Cortana either for mere privacy issues) are not even into question. The OS is lacking. There isn't any excuse. Can it be better? Yes, much better than Android, when Microsoft starts understanding users.