Here here R, totally agree! Just one example: look at the proliferation of used/faded gen inserts sold on places like VRM. It's obviously now more than acceptable for the "purists" to openly swap out, say, a service insert on their 1675 for a faded fat font Pepsi to make their watch more "original" or "vintage" (and pay an exorbitant amount of money in the process of doing so lol) and not many seem to turn their up nose at such a swap. And "gen" watches with refinished dials, hands, etc. even pop up in major auction house catalogs from time to time; though they may fetch significantly less (and the real intense purists won't touch them).
Personally, the reason why I decided to embark upon building a few frankens was not to labor over something that would just sit in a watch box, but to build something that I could actually wear (frequently) and enjoy without dropping close to $10K and constantly fretting over its use (and lest we forget, these are for the most part TOOL watches). Also, the depth of knowledge attained by those who build frankens is immeasurable, and there is enjoyment to be had not only from building such a watch, but also knowing every last minute detail about it; many "purists" who would scoff at these builds could not tell you nearly as much about the same watch on their wrist that they just happened to pay the $10K/$20K/$30K for because it's "factory gen". And i think as long as deceit or a nefarious sale isn't the objective, then there should absolutely be great pride in building an uber franken, because as many of us know, it takes a lot more blood sweat and tears to build your grail than it does to merely hit "Buy It Now" on eBay.