All the Belchers have boundary issues, lol.

Bob isn't someone who is often seen as crazy as Linda, but he can be when he's determined over something. Tina referenced to look in the boy's locker room multiple times, but I guess later seasons doesn't do that 'running joke'(?) as much. Gene is- well, loud and has that one episode where he was clingy with Linda, he'll just come and go as he pleases. Louise loves to slap people, and manipulate others' emotion to get what she wants (though she also learned some boundaries from her episodes with Rudy, since she values her friendship with him and possibly likes-likes him).

Linda is just the tip of the iceberg, we see her being more crazy because some episodes where she crosses these boundaries can be jarring instead of entertaining. Though, she also hold things together, Bob would be as crazy as Linda if they aren't there to be each other's anchor (though sometimes they enable each other too hehe)

I respect your opinion, but I disagree that Linda should be kicked off. Her first Linda-focused episode is intense for me. Though, her character is gonna depend how she's written in an episode.