I do a lot of macro with small critters, particularly insects, and I've been pushing this on the forum for years. Others who do critter macro work have suggested similar things. So apparently Canon continues to listen to their customer base.
With insects, more light is a huge help as I typically work handheld. The difference in DOF from f/2.8 is less of a problem than one might think, and you still have the option of stopping down. But the chief difficulty is that magnification makes motion and vibration much, much worse. Obtaining twice the light means halving the shutter speed, and that is often the difference between a keeper and a tosser in this work.
That's where you lost me, cause no one is gonna shoot at F2 with that lens unless they focus stack, and even then they're gonna have their rig on a tripod so shutter speeds aren't going to be an issue. The only benefit going from F2.8 to F2 is a brighter view finder, something that's almost a non-issue for a camera that has an EVF. Either this rumor is someone's wishful thinking, or Canon is trying to appeal to the large number of people who buy the 100mm L macro lens cause they can use it for portraits. Most people who shoot with a 100mm lens don't use it at minimum focus anyway, since it's a poor focal length for any light source. Not really enough working distance for natural light, and actually too much working distance when using a flash.
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