Windthrown thanks fer the correction... the oaks don't grow much here.
And michell whatever... I'd quote ya but it would take all day...
The bore with a strap thing is GOL all the way. I suppose it has its uses though honestly I don't use it often only on severe leaners. Honestly GOL/SSD has been beaten to death on this particular forum for years, and doing so again sound wearisome... though if pushed I will feel better after beating up on some swedish nonsense.
As far as jacking I personally don't jack nearly as often as I probably should, my jacks are 25 ton automotive jacks and therefore are very heavy, so the work they would save on beating wedges is lost on dragging them around. So I only drag em out when I have a large tree with obvious back lean or get into trouble and run out of wedges, like on the cedar in the picture. Sometimes if I'm close to the crummy and have a less then ideal fall, I'll go ahead and plan on using em, they are very smooth when it comes to lift so there is possibly less shock to the hold wood... maybe? You should still back up a jack with wedges any way, don't necessarily have to beat on em but just keep em tight, so if the jack fails and they eventually will, the wedges are there to take the weight.
As far as wedging or jacking a heavy back leaner over, every method has its limits, and judgment comes into play. Without giving specifics if it looks like a lot of lean it gets pulled or pushed depending on what kind of equipment is available, or in the case of the current job leave em as not worth the effort.
Also I regularly work in target rich environments, probably 10% of the trees I fall threaten structures of some sort or another with direct lean or close enough to warrant a line hung in em. Of the rest probably 60% or better would be considered "danger" trees in that they are close enough to damage structures if they where to fall in that general direction, which legally around here is a tree length and a half to the stump to the nearest building.