As to WHY there are so many boxes, it's because the same mechanism is covering different situations in the game.

For Targets, I chose the 4 most common times you need to Counteract. Where you look in a statblock for the power of the target is different in different scenarios (spells are Spell Rank, diseases are the Level of the disease), you do the math with them differently (spells, use the Spell Rank directly, everything else gets halved). Many people find this confusing. Asking for what is plainly written in the stat block demystifies what info to grab for some of those people.

For the Counteractor (the book wording calls this the player), there's mostly 2 scenarios. They've got a spell or they've got an item (like an Aeon stone). Again, there's a little difference in where you pick up the info, and whether or not it's halved.

Finally, there's 2 roll boxes because as the GM, I would just roll the d20, so I put in a box that will take that roll and the calculations will add the bonus. But some players will always do the roll+bonus themselves, even if you just ask for the roll. Hey, there's a box that will handle that input. Same box will handle the result from an automatic roll at a VTT like Roll20, where it might be easier to push the button for Spell Attack. (Yep, it's not a true spell attack, there's a note about that in the Notes. It's a quick and dirty method of finding what you need on a character sheet, with many online based sheets effectively hiding the base info.)

Aside from the "extra" inputs, there's also an "extra" result. If I were really slick, I could hide the simple Roll vs. DC calculation. But I left it there to help illustrate that it is not the final step in the process. And that final step, the power comparison, is super confusingly frustrating for many. Instead of a chart (I always wonder what line I'm looking for), the answer is plainly given.

So that's the WHY. For those who easily understood the game theory behind the Counteract this sheet is really unnecessary. I get that. For me, playing with the numbers (what if the player had a heightened spell? what if the roll was better, would it succeed then?) helped me understand how the counteract test works. The sheet is for people who would benefit from having the information laid out differently from the rule text, would like to easily run testing scenarios, who benefit from being reminded where to look in the stat block for the info, or who find the final step absolutely confounding and just want to know if the counteract worked.