Okay then, let me try to reduce the weight you say I lent to the notion that there can not be a negative side to a chumra:
I hereby state that there can be a negative side to a chumra. I never implied otherwise but if you inferred that I did I hereby formally retract such implication.
In particular, regarding refraining from wearing sunglasses, I have heard that there are some horror stories regarding that conduct.
Perhaps you can post said stories. Besides probably being fascinating, it would certainly demonstrate the point you would like to make clearer. Namely that there are chumros that have a negative side.
Thank you