Tire regrooving

We installed set of new Firestone tires several years ago prior to our cross country trip. The tires have been problematic with vibration issues till I took truck to Wilmington, NC couple years ago and they "trued" them. What a difference. Since then they have done great. With winter coming on I decided to take the truck to local truck stop and have sipes cut on both sides of the rubber for traction. The before and after photos made a world of difference to the look of the tires. #ad
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Did all of the firestone tires of that model look like that ? They almost look like they were not finished correctly out of the factory.

 

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This is a photo of tire new. All six of my tires were shaved to "round" and "true" them.

 

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This is what they looked like with trueing was finished.

 

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