Because he's too nice to say:
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Grammers alcohol, cocaine, and other addictions made production difficult on the first show.
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Grammer is pro-trump and anti-lgbtq among lots of other things while Hyde actually has a heart
"I wanted to do other things" isn't the answer people are looking for, because the question is "why don't you want to do this" the "I stead of other things" is obviously implied.