Per the holes, it doesn't however the hole left behind is so small it fills almost immediately.
Per the DNR, if you were to study the sedimentary plume from scooping vs. the vac you'd find there is equal siltation from lifting a scoop to the surface and shaking it or pouring it into the screen, as long as the solids volume was equal which it is not.
I can assure you that in a side by side comparison the scoops cause more bottom damage than the vac. I have studied it and the state agrees. I would be interested in someone showing the comparison to dredging. Technically or practically it doesn't exist. .4l vs. 8l of material per target (assuming a 1 scoop recovery) I know because I went through an Major Environmental Impact study and have the engineering report that was submitted to our state DEC.
Look, we all have to live by rules, the key is understanding the rules and living within them. If you enjoy scooping, then by all means do so but if you want to challenge the status quo then stand up and be heard. Do any of you say to the nice home owner, would you mind if I ripped up your yard, ma'am?
My intent here was to help those people who simply cannot scoop 300x per day. My permissions did not come easily nor was the educational curve inexpensive. Use what works for you, the country is still semi-free.
Again, thanks.