Yes, I realized this years ago as well. Most people's bechers are unnecessarily large for the shiur.
So many people unnecessarily torture themselves by using these "standard" size bechers. Not even talking about the people who have these ridiculously large sized ones, or the fact that the larger volume of silver = higher price, ממש עולם גולם.
When I realized this, I went to get new bechers before the next pesach. What a difference.