Thats not universally true, probably not even mostly true. I must have taken a few hundred flights from Schiphol with KLM and was never id-checked on flights w

Thats not universally true, probably not even mostly true. I must have taken a few hundred flights from Schiphol with KLM and was never id-checked on flights within Schengen. There are airports when checks are performed but far from all of them.