I don't think I agree with the premise that all D&D editions fall apart around level 10.

What is true, at least for 2e and 3.5, is that there is a paradigm shift at higher levels. Higher level parties need different kinds of adventures than lower level parties.
This only becomes a problem if the DM (or the players) don't realize that shift, or are not interested or able to provide the type of adventure suitable for higher level play.

Sadly this seems to be true way to often for the writers of published adventures. You're seeing the same simple dungeon layouts just with tougher enemies passed as an adventure for high level characters.
Thats not how it should be. The discrete encounter model just won't cut it. A good high level adventure should operate on a grander scope. Politics, information gathering and combat-as-war become increasingly important themes as you get into higher levels.

A good high level campaign can be very rewarding for both the players and the DM, because of the increased complexity.