I heard the validity argument too, just recently again. It's illogical. Every spam email is a valid email, otherwise it wouldn't exist. Spam is subjective and the overwhelming amount of people see inscriptions as such, apart from the exploit they are utilizing.

Validity in itself on some network level is not an argument. Bitcoin is an object made for humans, it would be nothing and mean nothing without us subjects. Its purpose and impact are entirely subjective, so already subjectively we can dismiss the inscription spam run by some scammers trying to extract value from gamblers who give zero fucks about the environment they are gambling in or network they are gambling on. They move to the next new thing as soon as it arrives and we never hear from them again.

Inscriptions and oridnals have nothing to do with Bitcoin.