There are only a few services that offer cross-section weather along a route:
- Gramet - it's old, doesn't update and offer to build a route from airport to airport
- Autorouter - an improved version of Gramet. You can check weather along any route and it use more advanced GFS model, but it's still not very reliable.
- Meteoblue - the same old GFS data, with, allegedly, some adjustments, but I eventually found, over many flights, that it was too unreliable to tell me anything which wasn’t blindingly obvious from the MSLP.
So my question is, can we expect such a feature from Windy, considering that you have so much weather data at your finger tips?
Please, make sure there will be at least an option to input enroute altitude, average moving speed (in still air) and how it's going to be affected by winds aloft to get an appropriate timings. Vertical speed would be a huge plus to see your path in climbing/descent phase of the flight. Hopefully, it's not going to be overly complicated to imply.