Yes buts it’s inevitable that the child at some point will notice other adults/people who use the smartphone in that manner so the belief that it’s okay to passively consume will be reinforced no matter what the parents behavior is
that's a strange take to me, like why say it? the kid will spend 99% of their formidable time with the parents. sure, baby sitting, grand parents, and over time other external influences creep in, but why turn this into a "yes, but"?
especially when these influences absolutely don't have equal weight.