That's the thing. When a club fails to achieve a milestone in a season then coach is the first to get all the blames and likewise when the club performs exceptionally. I don't know how and what the conditions for Ten Hag contract with Bayer Leverkusen are but I think if one of those was to manage the team with little resources that can't bring in all the needed players in different positions to help the team stay competitive then it's going to be a problem for him, worse than what we saw with him at United.
Being a coach in our times is not among the jobs I would decline because of the pressure and the danger to lose my job today or tomorrow. If they sign their contracts and get sacked, life goes on on the Bahamas or Maldives or Mallorca or wherever their holiday mansions are. They don't care. Bayer Leverkusen is backed by pharmaceutical giant Bayer and money has never been a problem for them, especially now that they sold Wirtz and Frimpong. I think ten Hag will get the money he wants, at least for most players. The finances shouldn't be the reason he can't be successful.