While I consider this to be a good thing in general, I do fear it may cement Chrome's browser monoculture dominance further (even if on iOS it does still use WebKit instead of Blink).
My bookmarks stay synced between all three browsers on my computer and phone.
I'm relying on Xbrowsersync for now but it's still not the optimal "everything everywhere" solution, as it does not support syncing to Safari (and from reading their website, its developer appears to be ideologically opposed to implementing it).