Veloviewer is a strava plug-in, and their target audience is segment hunters. Us saddo tile baggers are a minority really, most folks are there for the faster-and-further stats.
I've already been peeved by a lack of segment timing- I wanted to guesstimate how long a route would take me by looking at my teammates times. I don't know if the peevishness will result in me coughing up for Strava. It's not like I actually use it- I barely follow anyone, and all my ride data is stored elsewhere.
As a Strava plug-in, VV is never going to join up with another route planner, best we can hope is he finds a developer who can make it play again.