65% isn’t a hard and fast rule. You can score 70%, 80% at any level and if you don’t want to move up, you don’t have to. And some people have horses that do just fine at the lower levels but struggle to have the proper collection at the higher levels. No problem with that. This isn’t a discussion about what any individual decides to do with their riding and their particular horse. Just a discussion of why entries are down at Nationals and these are possible suggestions as to why.
IMHO, the judging criteria changed in the middle of the season and no one is saying why.