This is what hurts Piccolo more nowadays than any sort of power scaling imo. Sure, they made Special Beam Cannon a force to be reckoned with again, but he has more techniques than that in his arsenal.
Imagine if Z Piccolo simply just relied on SBC during his fight with 17; would not have gone over well. He stalemated with 17 at the time because he was a fighting genius then. Now? Well, he could be worse, but could also definitely be better.
The problem with being a fighting genius in DBZ/Super is that it doesn't matter if the foe is so much more powerful than you. And that's usually the case. Against 17, he had a chance.
But put him against 16 in that same time, and none of his fighting skills would have amounted to much of anything.
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#17 was "just about" as strong as Goku and Vegeta during the ToP:
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Although they're obviously WAY more powerful than him now.
But yeah, based on their fights with Saganbo, #17 and Piccolo seem like peers, implying that they both possess SSB-level power... Which doesn't particularly bother me(even though it's completely illogical), because I am a fan of anyone not named "Goku" or "Vegeta" still being relevant at this point. /shrug
__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."