This is just a problem of lack of familiarity with the space. Crab apples are indeed much less palatable than Red Delicious apples.
I buy honeycrisp only for its texture, so I can't comment on the sweetness ratings as it's not my thing.
Although its ability never to oxidize and turn brown feels downright unnatural. You can leave a cut cosmic crisp on the counter for days and it just stays yellowy white. Weird.
However, I find cripp's pink to be wildly variable. Some are beautifully crisp and very tart, these are my favorite. One store by me sells them and they just taste like red delicious, despite having the color and whatnot.
The sourness of Cosmic Crisp is probably why it doesn't oxidize readily.
Eh.... the Red Delicious's twin in naming is the Golden Delicious. Golden is a more prestigious description than red by any standard, and they're both "delicious". If you want to credit naming and marketing with the success of the Red Delicious, you need to explain why the Golden Delicious didn't succeed even more.