"might add a negative value" can be said about anyone. Many high profile engineers at SpaceX who revolutionized the industry have given high praise to Musk that is significantly more specific than what you'd expect from merely appeasing his ego.

This view seems mostly driven by his political associations with Trump, and his recent behavior on places like Twitter/X, which you have to distinguish from his other activities.

That being said, I thought the idolatrous fawning over Musk about 10 years ago, by the same people who now hate him, was obnoxious and sickening even then. Which goes to show: simply wait 5 minutes for the mob's little gods and petty messiahs to fall from grace, before they move onto the next celebrity to worship.