Sharepoint is like a big umbrella intranet/collaboration enterprise product. It's old, has a million sub-products, is heavily customizable, and is not really intended for normal users to actively do too much with beyond swap files. Onedrive is just microsoft branded dropbox or google drive. Since it's more focused and is a consumer-facing product, not really surprising that users prefer it. While I wouldn't call sharepoint deprecated per se, MS will probably continue to encourage larger and larger companies to just work out of onedrive.