This is frequently still beneficial for the organisation, even when you're doing it for the wrong reasons, and is almost a necessary stepping stone towards achieving true understanding. It's hard to identify nuance until you discover some strongly held belief doesn't apply as well you once thought.
But I suppose if you could go back and do it differently, you would, so I can appreciate why you consider this to be a mistake.
One important distinction is between holding strong opinions personally vs being in a position of authority and forcing those (strongly held, weakly justified) opinions on the rest of the team. That’s a quick way to erode morale.
Flip side of the coin: having strong opinions but being open to discussion and reconsidering your position in the face of new evidence is a great way to earn respect.
But I suppose if you could go back and do it differently, you would, so I can appreciate why you consider this to be a mistake.