Huh? Every page in One Piece is relevant, cause stuff actually happens that effects the story and sometimes even the bigger lore of One Piece.
In Bleach, you literally have pages where you see the characters in detail do every single move in a fight, mind you moves that we've already seen in the previous fights before, in a slow fashion for literally volumes upon volumes of release. All Bleach is, is a manga where fighting is the focus and some intermissions of story (if we're lucky). One Piece, on the other hand, actually fills it's pages with legitimate content whether it's for gags, for story progression, for character interaction, and just progression in general for every chapter.
One Piece, as a manga, has a lot more going on than Bleach does, so it's content is far from irrelevant or useless. One Piece doesn't spend useless time with action scenes with every volume of release, there's actual story arcs and progression going on at a normal pace.
Hell there's more story progression and content in the cover story arcs of One Piece than there is in multiple chapters of Bleach.