I may not have explained it properly,
1st Shoot thowline high in tree, it dosnt mater where the line comes down as long as the high point is safe, pull rope through.
2nd Attach pully to end of rope, place lifeline "DRT" through pully then pull up tree, thus creating frictionless attachment point.
3rd Attach end of first rope to base of tree using "safe" knot. so the system is set up so that if the first rope is undone and "lowered" the climber can be lowered at anytime. its even easyer to lower climber/tension rope if a grigri or prussic is used.
I would not normaly use this for removals as i just adds extra lines in the tree, and the system could get damaged.
This system works well for me on cypress, cedar, pines, because i can shoot the line over a high point and not need to get the line back down the way it went up, you can just brind it down and not worry about where it goes.
Im not saying i use it all the time, but its just another one of those things that i use to make climbing easyer for me. some wont like climbing on the pully as it takes time to get used to no friction.
you can also get a groundy to "pull" you up the tree
What things do "you" like to use to make climbing easyer.