For folks that are flying for the very first time, maybe this would make sense. However, most folks have flown at least once or twice before in their lifetime. The safety announcements never change - make sure you have your seatbelt on when the light's on, or even when the light isn't on when you're seated; make sure you know where the nearest emergency exit is, even if it's behind you; if the masks come down, put on yours first before helping others... etc etc etc. Most people that have flown even a couple of times could probably recite the whole damn thing from memory.
The fact is that flight attendants don't care about safety, or at least enforcing all FAA policies around safety, in reality. I usually sit in the exit rows because I'm very tall, and the requirement is that a person understand English and provide a verbal "yes" when asked if they can perform the requirements of opening the door and keeping the aisle clear in case of an emergency. First of all, being able to say "yes" doesn't mean that you know English, particularly if you're the 12th person being asked and you just emulate what everyone else did. Secondly, I've actually been in situations where the flight attendant asked and it was obvious a seated passenger didn't know English, wasn't listening, or otherwise didn't understand and the attendant says something like "just say 'yes', I need you to verbally say 'yes'" - it's like leading the witness. If that regulation is there for safety, if you ask the question once, maybe twice, and they don't give a "yes" on their own, then perhaps they shouldn't be seated there.