OP doesn't like mastodon for the same reasons [they] didn't like Twitter. That would be mostly:

- "It's not really possible to use Twitter without at least a little bit of doomscrolling"

- "I think that the core concept of a "tweet" is fundamentally unhealthy, because by design it promotes angry and extreme content."

- "Most users don't understand that by "dunking" on someone, they are actually promoting the content."

This is basically a critic of fast-paced short interaction based on an infinite timeline. The comment about TV afterwards may seem weird but for me it makes sense. The whole concept of having everything in a single bucket is very TV-like. I don't believe user behavior will be very different on mastodon than twitter: people will follow some very productive accounts and their feed will be dominated by these.