I actually just finished a manuscript with overleaf and published it on biorxiv (shameless plug: http://biorxiv.org/content/early/2016/07/25/065789.1). Unfortunately, latex isn't used that widely in biological sciences. There is a bit of a learning curve that people just aren't willing to invest time in. During preparation of the manuscript, I had to convert latex to word to distribute to collaborators and then manually edit the latex file accordingly afterwards.
Maybe this type of service where it is more microsoft office based will be better when collaborating with non-computational inclined people.
Maybe this type of service where it is more microsoft office based will be better when collaborating with non-computational inclined people.