Nope. Primarily, this stance is hostile to international users. We have all the tools required to transparently move data from the front-end to the backend, and

Nope. Primarily, this stance is hostile to international users. We have all the tools required to transparently move data from the front-end to the backend, and back to the UI. Furthermore, simply because my password begins with '{', contains '{', or is 4367 characters long shouldn't be a concern whatsoever. Sanitization is an ignorantly dangerous practice, because it obscures much safer practices. Validation? That's for business rules. No more order items than there are things in stock, and stuff like that. If you need to do that because something in your stack needs it, then it's far past the time to reconsider your stack.