What is the difference between Master Specialist and Professional?

Professionals - automatically - take into account the perspective of the stakeholders, while (Master) Specialists - automatically - take the system as their starting point, because they cannot (fully) fathom the context in its abstraction. The Specialist starts from the solution, and therefore lacks the context. Professionals reverse it, as it were: what requirements must the solution meet given the various interests. Together they are strong!

The bottom line is that a Master Specialist is still deep down a person who thinks and acts operationally. So you can advise him very well from his field, but not include the perspective of stakeholders in his advice, strategy, etc. They often say that openly: they hate administrative situations: it must remain concrete for them. Not working with all those agendas and unclear considerations, compromises, etc.