fnork - in the UK we say "stretchy" meaning something needs an ability to stretch (reach - ie needing a wide hand stretch). I know Op10.1 isnt a stretching excersise but I manage it but someone with an 8ve reach (stretch) would probably find this difficult. Hence - its stretchy. Just a difference of colloqial language.
I began this etude like 2 days ago and have relatively small hands. I can reach a 10th and it is my big limit. It's not so comfortable but it's ok. The trick in this etude is NOT to stretch, but to do the phrasings by an horizontal move of the wrist. I really don't think having bigger hands would help with this one.