you should not use a biner on the harness end you should use a snap shackle with a lanyard to release the gate. that way when your hung up or being dragged you can release yourself with out having to pull you weight off the lanyard
I have seen the "double-squeeze" biners jam up with dirt or ice too many times. Too many parts.
No thanks. I have taken many hundreds, probably thousands of falls on carabiners and they are what I trust. If I want extra safety, I can use 2 biners or an ordinary locker (no auto-lockers - they don't deal with ice, dirt, or salt well).
If I am being dragged, releasing myself is generally a death sentence, isn't it? If there is another person helping me, presumably they would have given me another rope and the existing tether will be released with a knife. There are many on board and 2 under the helm seat.
There are numerous tricks for releasing a biner under load, not easy, but I guess I have done it a lot. There are also habits for clipping biners to prevent them from self-unclipping (never clip to a hard point; clip from underneath, with the gate facing out - this also makes it easier to unclip under load). Safety biners are a lot more idiot proof, so I do understand.
But I understand yours is the majority opinion. I'm OK with that.