Hmm. I'm trying not to be sceptical. You mention you've been using Paperpile since the very early days, yet you joined the Paperpile forums just one hour ago to promote a rival product.
Perhaps I should give you benefit of the doubt even though your post read like an advertisement for a rival product.
I'll address a couple of your points.
I did try f1000 a few weeks ago. I found it a huge, stinking, pile of clunky turd. My subjective opinion of course, but it was a horrible user experience. Using it was as 'sucky' as their 'sucky' name: F1000 sounds like an oil company.
I wonder about the geese flocking to them. It would be interesting to know how many university libraries are recommending f1000. Certainly, not the some of the major ones in the UK where I spend my time (Edinburgh, Oxford, Glasgow, Birmingham, and Warwick). I'm yet to hear of my peers or colleagues talking excitedly about it.
Here's another bugbear: the 'geese' always seems to mean just scientists as if people in the humanities don't have piles and piles of references. F1000 is set up for scientists, so not so many of numerous arts and humanities researchers will be flocking to it. These 'geese' will be going elsewhere.
What about the 'geese' who use chromebooks? A huge market in the education world. Paperpile reigns supreme here. Clunky f1000 has a chrome extension, but from what I'm hearing it doesn't work properly on a chromebook. That's more 'geese' that f1000 have lost.
By the way, it's 2017, plenty of people do now write papers, serious papers, on their tablets, and it's likely more will over the coming decade. So I guess those 'geese' won't be using f1000 either if the f1000 people have a distaste for tablets. Hopefully, the Paperpile tablet app will move from read only to full usability with time. But in the meantime I welcome reading and accessing my papers on the bus.
But yes a Word add on for Paperpile is a must.
Otherwise, creating a new account to promote your product and trash another product seems a little bit 'sucky' to me, and makes me want to avoid the clunky STEM bias crappy software that is F1000.