I was never required to know every scale & arpeggio and be able to play them two octaves. I do know most of them, but can’t reliably play much above a D above the staff.
I was required in the early 1970's in West Virginia, Dr-GO was required while in high school in Ohio, and most All-State requirements says "know all twelve major scales two octaves and arpeggios. Sounds like you have a new mountain to climb. All twelve major scales two octaves with their arpeggios. Now you poopoo an idea because you can't do it? What in the world is wrong with you? No wait! You're the fox in the grape orchard that jumped and jumped and couldn't reach the ripest grapes. Upon realizing he couldn't reach the grapes, the fox said to himself, "oh, the grapes were probably sour anyway"
You can't do what a high school trumpet player is required to know if they try out for All-State. On a side note, why the hell do you even comment if its something you are not interested in? Here's your words; " I don’t really care that I can’t do it." Then why comment unless you wish to be a turd stirrer?
You asked, how many can do it? I replied that I can’t, and I seriously doubt that the majority of trumpet players can. Sounds like you’re a bit stressed, my talented friend. I can still play rings around most high school players, BTW. I’d love to be able to play into the stratosphere, but it ain’t going to happen at this late age. There’s a lot more to playing than scales (which I do practice often) and high notes that many of us never see in a piece of written music.