Nobody whined about how the Straw Hats were hogging the spotlight in Pre Timeskip.
Besides, the main issue isn’t characters having too much screentime or not, its the fact that the PLOT CANNOT PROGRESS unless there’s only a handful of relevant characters at play not 1 million side characters doing unimportant jackshit.
If this story focused only on Luffy and Robin for example, the journey to Laugh Tale would be much faster, we’d probably be there by chapter 500 now.
But Oda doesn’t like this. He wants to drag this shitshow for as long as possible by shoving 999 new useless characters every single arc.
Tl;dr Mid Piece will get cash milked to death until 2050 enjoy