Serious photographers know how to write f/2.
You obviously don't shoot live butterflies in the field, or anything else that moves significantly. Tripods are impossible for rapidly moving subjects like these, and to blur the background shallower DOF is often required. Flash often scares the subject off when one is a few inches away, so this is unacceptable for capturing complex behavior. What is required is some skill and experience: f/2 is quite manageable if one places the subject in the plane of focus, and if one knows the behavior of the subject this is straightforward. I manage this quite fine with the shallower DOF that comes from higher magnification, so f/2 at 1x seems generous to me. Maybe you should gain some experience in this area. When you get to the point you can shoot hundreds of different live Lepidoptera razor sharp from eye to wing tip with scales visible in an afternoon, you'll learn that what works for big, still things doesn't for small, fast-moving, skittish things.
Attached is an image captured today as this female is laying an egg on Eriogonum, f/4.5 handheld, natural light, 1x magnification. Subject is less than an inch tall. This skittish species has excellent vision and can easily see an approaching person from 20 feet away. Show us you can do likewise.
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