Not to beat a dead horse but....
You obviously missed a lot of what people were saying.
No one said EVERY EMT sucks or anything like that. I came from an EMT job too. I would NEVER have felt comfortable as an EMT c/ something like an IO or LMA. I would have left that up to the medic. Maybe that's a bad thing on my part, but I was raised in a system where I knew my limits. Advanced care belongs to a advanced provider. I can't say I know your area, but my EMT school was 3 months long, 1 night a week. That was 10 years ago. Maybe it's gotten better, but I left that EMT program and learned nothing except a few anatomy things. I learned everything from experience and mostly from medic school. Medic school was actually a wake up call for my brain.
You also mentioned the Combitube which I also think shouldn't belong to BLS, but if your medical director is comfortable with it., great! On that note, I think the reason most people are saying no to BLS being afforded these skills, is because BLS agencies USUALLY do not have a medical director, or rather not one who actually involves himself. Unless you work in a BLS/ALS joint system. I never had a medical director as a BLS provider. It was all State Protocols.
I think what most people are saying is, not to discredit BLS, but how often are you going to be using these skills and tested on these skills? As a medic, at least where I am, you have to have x amount of successful tubes, otherwise you get remediation, x amount of successful IV's, x amount of IO's, ETC. Is your medical director going to update training at least yearly for all EMT's practicing these skills? Is every other BLS agency going to do the same? That's the point. Back in NJ where I came from, EMT's could basically kill somebody before the State actually stepped in and did something. EMT's could be dumb as a box of hair, but answered to NO ONE! They had no medical directors to answer if they screwed up, and only rarely did some BLS agencies investigate negligence on the EMT's part. I can't trust a program like that to give EMT's more to do harm to a pt with.