RidewithGPS is great!
Never had any pop up. I just use the tools I need. And more important: I don't use heat map.
With multiple route failures (described here in this thread -
https://www.bikeforums.net/touring/1...-ride-gps.html) - I find it useful to sanity check with the heat maps to double check if other cyclists have come through a similar route. It may not be as big of an issue if your world is New Jersey but I found in less populated areas it would pick routes that included (a) private roads (b) misleading assumption that if the road type was "unknown" it would be paved (c) one or two cases of a road not existing. In those less populated parts of the US, I would do as well with a state highway map e.g. South Dakota. However, otherwise it is a useful tool including for me in more urban areas and including the heat map as a cross-check.