Is intellectual validation a necessary motivator to you?
If I understand you correctly, you seem to be alluding to the thought that as long as a result is satisfactory (good argumentation), the internal reason for why one has achieved the result is irrelevant?
If so, it is certainly an interesting point. However, I see a potential flaw with it. It would appear to me that withholding the true reasons from yourself for why you desire to achieve a particular result would lead to ingenuity towards yourself.
"I volunteer at the church because I like to spread the word of God" and "I volunteer at the church because spreading the word of God makes me feel validated by like-minded people".
The second reason has introspective soundness to it, and the first one does not. A person who would use the second justification is far more confident with who they are as a person. And as a result, that person would be more likely to remain motivated in their undertaking to achieve the desired result.