tried to construct routes a few times using rwgps and routes came out/interface was okay. find it easier and relatively accurate to use strava route builder
(not sure if this is part of the "free" strava but i'd doubt it) on a desktop computer. i may be a rarity amongst riders constructing/saving routes.
generally, i use saved routes as a reminder of where to ride and virtual recon vs actually referring to the preplanned route if i'm actually riding it. i've just
learned to memorize the route in advance if there's a tech breakdown (which i've been privvy to). all that said, it's usually pretty easy to follow someone's posted route that is
frequenly done via rwgps, whether it be a solo/small ride or a charity/century ride.