Depends on the quality of the advice, doesn't it?
There is no certain "bad" form, however "hire slowly, fire quickly" always seems to make sense to me...
And, it's a two way street - it's not considered "bad form" when a seller and I do not see eye to eye on marketing and listing of a property, and then I tell them that I am not interested in being their agent.
Bad form is rampant in our business, it's rampant in America, however in the context of your question - no because it depends on the quality of the advice.
Sellers should not ever feel obligated to hire someone if they are not 100% comfortable with that person and their team.