I'm not inclined to answer your post in any logical format, but here are my thoughts.
My company only allows us to fly the 737 autothrottles either engaged or fully disengaged. This stinks, and I've told them so, because the best way to fly the throttles is "ARMED/Deselected". They're concerned about automation surprises in the flare. They've had a couple of instances where the throttles went to Max Power because the crew got 5 kts below Vref. The exact programming for this varies from airplane to airplane, depending on software installed. So, I told them, "Let's require crews who use the ARMED technique to click the throttles off at 50, 100, or 200 feet." But, there's no reasoning with them. They've decided to throw the baby out with the bathwater. It's become somebody's little peave and they insist on micromanaging this phase of flight for us.
Here's what I do. The autothrottles can really throw your trim off coming up final. As a former 767 guy, this is quite noticable. So I disconnect them and fly between Vref + 5 and the white bug. Conservative most of the time. In turbulence, I let the speed bounce around and don't try to chase it, like the autothrottles are inclined to. I look at my speed crossing the threshhold and pull my power and watch the sink accordingly. The airplane handles so much better with the throttles disconnected. If I have to GA, stand the power up, and turn on the AT switch. I hate TOGA mode, unless I'm in mountainous areas, so I quickly transition to V/S 1500'/min up.
My two cents.
Cheers!