I just realized that due to the RWR rework, US jets under br 11.0, except a10/av8, will not warn you of Russian radar locks. Your RWR only warns for bands E, G, I while Mig 21s use band J.
So be careful when trying to play at alt.
Stuff like the Harriers especially the AV8A have a crazy amount of countermeasures so distracting R3Rs and the Like should definitely not be a huge problem
Their rwr didnt change so it wouldnt affect them anyway.