I have noticed that the auto-routing does not match the frequently flown routes of the real airlines or the first waypoint after the SID is selected incorrectly.
I know that it depends on the weather, but 98% of the flights to the Canary Islands (LEPA,LPFR,LPMA, GCTS…) fly via the “MODRU” SID.
I get the waypoint “COLA VOR/DME” as the first point after the SID for high airways.
Only with low airways MODRU is selected, but with a distance of more than 500 NM, low airways are not necessarily the right choice. I used Standard IFR and also Airline CAO for Auto-Routing.
I don’t know if this is also the case at other airports
Here the examples
Now with Low Airways
With Low Airways