I stand by the concept that, altering a typical Catskill 'style' dry fly, makes it a Catskill style fly no more. As an example, if you take a Light Hendrickson dry fly, trim top and bottom hackle flush, you now have what Al Caucci developed as a spinner. If you decide to tie a light Hendrickson with an abundance of hackle, you have not tied a Catskill 'style' even though it may be considered a Catskill 'pattern'. If you significantly* alter a specific design, you've changed the design and hence what it's called**.

None of this has anything to do with effectiveness of the fly. You may believe it is worse than, the same as, or better than the original.

* something that is easily observed upon a quick viewing.
** entirely up to you: perhaps variation, variant, imitation or any other word you choose.

Allan