GSTs are seldom if ever 'good things'.
GSTs are the best form of tax as they are less distorting than all other taxes, especially when combined with credits for the poor. The best form of taxation is a broad range of taxes all kept to the lowest rate possible.
“The art of taxation consists in so plucking the goose as to obtain the largest possible amount of feathers with the smallest possible amount of hissing”
Jean Baptiste Colbert quotes (French Economist and Minister of Finance under King Louis XIV of France. 1619-1683)
Please elaborate on your use of the verb 'to distort' in this context.