And there hasn't really been offscreening during the rai
No there's off screening.
The strawhats seperated and came together OFF SCREEN MULTIPLE TIMES
At one point Zoro and Luffy literally got seperated between two pages of each other OFF SCREEN.
The meeting between Marco and perospero was off screen. How kanjuro reached orochi was off screen. Everything surrounding the pleasure quater from Big mom chasing us sop and chopper to big mom chasing nsmi and carrot to us sop and chopper getting caught by numbers to sank disappearing and appearing was off screen
I can keep going but clearly the answer here is that you just don't care. You don't care about all these off screenings and that's why you literally didn't even remember they've happened DOZENS OF TIMES already.
Anyway, if your excuse for it being fine that this war has no central focus is that "The rest of wano was also scattered so it's literal climax can also be as unfocused" then... lame