Yes! The wave of peepholing was a huge & sudden change in the mid 1990s! Although both series fell during the period in which all voice mail went onto magnetic tapes in your home. It was a time of foment, I tell you.
See, e.g., "The Big Sleep" (1946) and Joe Brody being [spoiler alert] threatened by Carmen Sternwood then killed by Carol Lundgren, Arthur Gwynn Geiger's former driver and lover. Neither would have happened if but for a simple peephole.
#Peephole
quotingnprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqtfqd2awmvfe6uts9dd52c86fxlkwkklvvdaz05q2aezuyxz5r2fsy7skf0 (nprofile…skf0) "No doors have peep-holes."
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This makes the apartments on Seinfeld more high tech.