@Hero_Of_HyruleI suppose it comes down to how much Picross you can handle at once.
If you run close to the 'optimum upgrade path, you usually unlock a new set of puzzles every 1-2 weeks. That was a nice steady trickle for me, but I understand why some people would prefer the 'everything at once' approach.
I'm there now with Alt-World (Access to
dozens of new puzzles all at once), and it's a little overwhelming, lol.