I'll make this short and sweet.
During the Universe 6 Tournament, the anime began airing content before the corresponding manga chapters were released. By the Goku Black arc (around 2016 I believe), the anime was firmly ahead. Most people at the time watched the anime to see what happened next, while the manga released later. During the Tournament of Power, the anime finished its entire run in March 2018... on the other the manga didn't conclude that same arc until November 2018.
Let this sink in before you complain the anime wasn't true to the manga. It's hard to be true to a source material still being worked on. It's no wonder Goku never uses a form of hakai on merged zamasu. Or why the TOP is soooo much different.
Last thoughts, I believe the manga is better but I was also reading it as it came out so the shock for me was that it was different but better than the anime that I'd already watched.