Traditionally, wasn't the seed round used to keep the founders going during the early months and years? 400k will last a group of founders for years if they are

Traditionally, wasn't the seed round used to keep the founders going during the early months and years? 400k will last a group of founders for years if they are willing to live cheaply. Of course things change once you need to hire outsiders. But that's what the A round is for.