I think the sceptics say that there's a bit of a moral hazard in focusing too much on direct air capture, that the world needs to cut its emissions right now.
And I agree that the moral hazard issue is worrying, that if we became dependent on geoengineering and took away our efforts to do the rest, that would be tragic.
Moral hazard refers to the risk that one party in the contract should charge its own behavior and lead to the interests end damaged of the other party in the contract.