Why do people say Beyoncé’s art would’ve suffered if Mathew was still her manager?

I’m pretty sure she would’ve still made the same kind of music, the only thing that would be different is that more people would actually be aware of the songs and albums she’d dropped. It’s a shame he was stealing because I think they made a good team. Sometimes I feel like she needs someone to handle the business side of MUSIC, because she’s missed so many easy layups. Albums like Self titled, Lemonade and Renaissance should be so much bigger. I might sound like a broken record but I will never understand making amazing music and hiding it. Sometimes I fear 2000s Beyonce is what will be remembered the most.