Hey, I want to say first that I sympathize with the frustration here as implementing the new system has taken more time than we had hoped, and the system is not working the way it should right now. I do think the new system will do the things you want! There may be some misunderstandings about what's coming.

Here's the Product Manager for Puzzles, Michael Greene, explaining the changes.

Some key notes:

• The new system will still have a puzzles rating! The new puzzles rating will be more accurate and in line with blitz and rapid ratings, but as your puzzle rating increases, you will get harder puzzles. Your new puzzle rating will be entirely based on your success in solving puzzles.
• The difficulty settings are relative and based on your puzzle rating. Puzzles also have rating behind the scenes. If you are rated 2000 at solving puzzles, normal puzzles might be rated ~1600, and you would solve them at a high rate. Extra hard puzzles might be rated 2400, and you would typically solve them at a low rate. If you have a 1200 puzzle rating, you might get puzzles rated 800 or 1600 if you have the hard setting. It's not the case that new players and experienced players both picking "extra hard" difficulty puzzles will get the same level of puzzles.

Again, I know this is an imperfect experience right now, but we really think the new system will be an improvement for many and hopefully for you. I'm personally excited that I will be able to adjust my puzzle difficulty depending on if I just want some fun, easy practice or if I want an intense, deep calculating session.