I do not see any risks hiring out of the sector. To help manage the associated risk, you must zoom out from that individual hire and look how diluted your team is, in a specific subject matter. If you look at your team and realize you are too diluted and lacking subject matter experts that can become an issue, you then need to hire from a specific sector. Equally, if you keep hiring in the same image you can become too concentrated, a team so aligned to legacy technology they love and unable to innovate. It is like anything in life, it is about balance when looking at talent.