I absolutely LOVE my EF 100-400mm f/4.5-5.6L IS II and my EF 70-200mm f/4L IS lenses. I also love my Arca Compatible tripod clamps. Unfortunately, "never the twain shall meet".
It would be so easy, and not cost much more in manufacturing if Canon would cut grooves in the tripod feet for these lenses that could accommodate an Arca Compatible clamp.
I ended up purchasing an expensive Kirk aftermarket foot for my 100-400 Mk ii lens. I resent spending that much money to "upgrade" a lens which cost close to two thousand dollars.
I use an A/C plate to mount the 70-200mm camera/lens combination to the tripod clamp but, wish I could mount the foot directly to the clamp like I can with the Kirk aftermarket foot.
Please Canon, wake up to the 21st Century...