20mm shorter top tube (20mm extra stem length) brings you 20mm closer to the wheel you are sucking.
If that was a real consideration you'd see a team riding a fleet of 650C bikes to 'sit in'.
A longer stem on a race bike with less trail and quick steering puts more weight over the front wheel = more stability when ridden like a bastard.
@Thuekr started
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20mm shorter top tube (20mm extra stem length) brings you 20mm closer to the wheel you are sucking.