It's mostly the being used to it part. I lived at 6K for a year in California on a site with two courses and played plenty in the 7Ks. It is not as hard as people make it out to be to turn your flippy stuff at elevation. It just takes a minute to get used to each disc being basically a firm step more stable. Not hard to pull out some stuff with a bit more HS turn.Players who don't have a forehand have a much tougher challenge throwing backhand anhyzers successfully, especially if they're used to throwing them at lower elevation.
I'll tell you what I definitely still used my full range of discs to throw - from a champ glo firebird to a light roadrunner.