....*sigh*
The faults ARE ALWAYS ON THE PLAYER FOR EXECUTING A PUNISHABLE COMMAND, BUT SOME MISTAKES ARE SAFER FOR OTHER CHARACTERS. EXAMPLE:
So, I'm playing Ness, and Fox runs up to me, nairs in front of me and I grab him, down throw, follow up, get a hard read on his recovery, he's dead at 40%.
So, I'm playing Ness, and Zelda runs up to me, nairs in front of me and I grab her, down throw, she jumps away. Combo over, she took 12%.
Some mistakes cost other characters more.
The reason that this super heavy punish game exists on Fox/Falco (for the record, I think Falco is a fine character and needs no changes) is because of their dominating neutral game.
Fox is generally a glass canon characters, he combos EVERY CHARACTER IN THE GAME SUPER HARD and (almost) EVERY CHARACTER COMBOS HIM. So you may think this is equal and fair, but Fox DOMINATES (not just wins), the neutral harder than every other character (sans some of the god tiers). If you don't understand this at this point, there is zero hope for you.
Moving on, Fox is sitting here, forcing to you to approach after you already took 25% from laser camping, then, Fox uses his super fast nair, into another nair, into a grab, into an uthrow, into an uair, and he landed on the top platform of w/e stage and uaired you again. Now you're at 80% and in nair usmash range. So what does Fox do? Laser camp until you're in usmash range. Dominating neutral game and IMO that's fine.
What's not fine is throwing out a raw usmash and killing half the cast below 100% on a move that's near impossible to punish because it's so fast and huge.