ATHF is the only one of those that never tried to be anything other than funny. A lot of what made South Park cringye at times was Matt and Trey's shitty opinions bleeding through into the show and them using their characters to get on a soapbox. Same with McFarlane and Family Guy. ATHF doesn't have any characters acting as stand-ins for their showrunners, and it was so absurdist you couldn't even tell what the writers views on anything were.
Because while starting a landscaping business doesn't require any education or license, it does requires a decent amount of money, good credit and most importantly a willingness to exploit undocumented workers. Also, the fact that most of the owners are white guys while the employees are almost all brown probably attracts and appeals to guys who fantasize about running plantations or being an overseer.