Add 'track changes'/'suggestions mode' for Word Online
In Google Drive, we can share a file in 'comments' mode in which other users can make suggestions to the file BUT only the owner can accept or rejects them. It is pretty much how Word works when the 'track changes' option is enabled.
In OneDrive and Word Online, we can either share files with full edit rights or no edit right at all - this, makes collaboration work pretty much impossible in certain scenarios.
This seems to be related to those posts: