This was a machlokes between chasidishe rebbes early on. The baal hatanya was against it, but relented after many chasidim begged for it. Others advocated it outright.
As a source, the mishnah says that when one learns Torah properly, they have “ruach aitzah,” a spirit of advice.
Chazal also talk about how to invest money; putting a third in movable property, etc… So if chazal are giving you advice on how to be successful in business, it seems that this is something in the purview of a tzadik/rebbe/rosh Yeshiva
But everyone agrees on the importance of having a rebbe for life decisions, such as when and how to go to work, college, shiduchim, etc..