No one means no one gets in to marriage these days blindly, there are more information available of each other.
In the past, girl and boy never had seen each other, never had talked with each other. Still marriages lasted for decades and many happily lived, accepting each other strenghts and weaknesses.
Those marriages do not occur these days, with camera, video, phone, internet being available.
After saying ‘more so’, there was no need to add contradictory word ‘bigger’.