I saw some saltwater guides fishing vegetation that switched out trebles or single hooks on rip baits and was curious about 2.0 Squarebill or trap applications for certain areas with a lot of cover

If so Gamakatsu octopus is a good choice. Don't think I could stomach going with two hooks as opposed to six on my crankbaits though.

Nope just learn how to feather it thru stumps and rip it outta grass

In Florida (Lake Kissimmee specifically) during a drought you could find old Big O's with the back treble changed for a single. I found 6 of them one year, so it was definelty all the rage. The fact that I found 6 tells me it was not snag proof.

yes

offshore fishing it is done to increase the amount of pressure you can apply to the fish. better hookup into more meat/bone. I don't really see a benefit to doing it in freshwater. if worried about vegetation, use a chatterbait or swimjig or weedless swimbait.

that's why I was throwing that spinnerbait into those weeds on texoma.. couldn't get a treble bait in there to mimic the shad.

I started doing that on a few lures for when my wife and I go out to catch hybrids and sandies, so there's less chance of getting a hook in one of us while unhooking them.
I've been really impressed at how few times I've missed fish with them. Caught a bunch of sandies, hybrids, walleye and bass on them this summer.When fish get hooked, they get in the boat.

I have done this with some top waters as well. It made them a little more weed less but not what I was hoping for.