If a taxpayer has particularly bad "personal chemistry" with an auditor of the Internal Revenue Service (IRS), the IRS will replace the "agent" with another one. Now one can't make this request repeatedly, because it will be seen as "stalling," but a taxpayer can get one, possibly two replacements by request.
Suppose a client asked a professional services provider to replace a worker on the account, citing a pretty good reason; "The worker isn't on board with our strategy," or even, "The worker greatly annoys our CEO." Is the firm then under an obligation to send a new worker? (The firm has 5-10 professionals so it's not like a two person outfit whereby "The only replacement is me, and I'm otherwise engaged.") Would a law firm in this situation have a higher or lower "duty of care" in this situation than another professional firm?