MTG Salvation

I've been playing MTG for over 2 years, almost 3, and I mostly play commander. Recently, I've come to a conclusion that whenever I can, I should stop a tutor spell, be it mystical tutor, demonic tutor, or tooth and nail, Etc... and my reasoning for this is that tutoring is the most powerful thing you can do in magic, drawing cards being the second. Tutoring allows you to get an answer to adapt to a situation at any point, it can win the game, or drag out a game longer. Tutors are extremely powerful. But they also do more than just tutor. They allow you to shuffle your library, which can be extremely beneficial. For example, if you're getting flooded with lands, or not drawing any lands, a fresh shuffle can fix that. It can give the player the opportunity to cheat by stacking their deck, assemble combo pieces and so much more. However, recently I got into an argument with someone about this. They believe it's much better to counter or deal with the card they tutored for and not the tutor. Which begs the question of, to allow someone to tutor, or not to tutor? Can anyone give me some insight on your thoughts?