L Series Lens with no IS, Why?

[penderphoto]

I'm a Canon shooter and in particular L series lenses. But I have a question and it's also be discussed in a few fb groups that I posted the same question in. But I really would like to know from a Canon Rep what Canon the manufacturer has to say about this question that I have.  

Does anyone know why Canon put out there 24-70 2.8L with no IS? Its a Pro L lens. Why would they not add that feature? I've always wondered this, so I needed to calm my thoughts.  If your paying for L glass. I would assume you would get all the options available. If you use it or not. Now the tilt-shifts. I understand why those wouldn't have IS because there generally on a tripod anyways.  

I would love a Canon rep to chime in on this.  

Out of 27 L lenses. 

14 have IS.

4 are Tilt-shifts. 

Thank you for your time

[jrhoffman75]

“I've heard well you don't need it for that small of focal length. But the 18-55 kit lens has it. So that don't hold water with me. Cheap kit lens has it and not a L series pro lens.”

I don’t work for or represent Canon, but perhaps, as the cost of IS has come down, they decided to add it to lenses with smaller maximum apertures to allow greater exposure flexibility. Lower useable shutter speed capability with IS can compensate for the f/5.6 vs f/2.8 limitation.