The cool thing is that since it's analog, their kids CAN view it when they are 13. Video formats are a crapshoot into the future. What codecs will still be readable in the future? Who knows?
MANY (if not most) weddings prioritize video over stills because, of course, the B&G want their friends to see via Youtube and similar. The supposed lifespan of static materials (film, paper etc) comes with the tremendous risk in storage and handling: The dog ate it.
If the dog eats some sort of memory chip (or whatever) that's unimportant because the medium that counts is the medium that has already delivered the video (or stills or audios) to the phones (or whatever) of everybody they care about, or that will care about them far into the future.
A declining minority do still have 1950s expectations, whether just for wedding photography ... or for marriage itself.
We'd all be better off if relationships were memorialized with words...poems...promises... love letters...which by definition are almost always found on digital memories.