Why do most shoes come without insoles?

[Sadly Not Yohji Yamamoto]

This only occurred as curiosity to me recently. Besides sneakers, why do most shoes not come with removable insoles?

And besides the superior comfort and support it provides to some, necessary to others, are there reasons to not install insoles, particularly in boots?

Thank you.

Edited: Clarified due to info from johng.

 

[johng70]

I think you might be confused between a removable insole and a built-in insole. Many fine shoes have a cork layer between leather insole and the outsole. That allows the shoe to mold to your foot. Lasts much longer than a cheap cushioned insole.

 

[Sadly Not Yohji Yamamoto]

Johng70, thanks for the clarification.

Is it the nature of the cork padding or the leather sole that enables the shoe to mold to one's foot?

While you say that a cork layer is present in many fine shoes, generally speaking, is it common or uncommon in the broad spectrum of shoes, barring the finest and the cheapest?

Thank you.

 

[Falu_al]

Wow - I think we need to be more specific here. Dress shoes and sneakers are very different. Granted there is huge difference between dress shoes as well. Not all of them comes with a cork insole, as it depends on the price range.