The drawback with validating opinions is that they are drawn from memories and experiences. In a tai chi class, this is a problem.
A student may feel/think
that an exercise or drill should be performed a certain way...
Their opinion is worthless.
What matters is the means, the outcome, the actual, the truth.
Doing things your own way can be martially
suicidal; for you are drawing upon zero experience and no
skill rather than many years
of taijiquan practice.