So, I'm reading about so many people bike size regrets and they are talking what the bike is made of.

Please tell me, what does what it's made of have to do with a bike size?

If people go to the Little Bike Shop, they trust the place, they have been riding for years. Why blame the bike shop for selling them an ill fitting bike?

Sounds like when you go to try out a bed in a store, it could be the day your dead tired, Seally posture pedic feels great. Then 5 nights later they are complaining the store sold them a bed that was too hard.