By the way, Welcome!
Yep, all aspects but the wind, which is out of one's control. The farther up a stem, the more the wind will probably be an issue.
Most times, people get away with this type of stuff.
I always have a standing rule, If You Are Not Sure, Don't Do It...Stop...Say Something. It comes right after the If You Can't Do It Safely... rule
This is for employees, as well as myself. Too often, they don't recognize when they are not sure. Its usually follow up by, "Butt, I though...", and as we know, Butts are often closely associated with crap. Rarely do people get hurt when everyone works on the basis of being sure of everything. More realistically, injuries and property damage happen a lot less when people try to Plan the Work, Work the Plan, and evaluate If the Plan Worked.
Absolute surety is clearly an ideal, and can't happen most off the time, and especially with humans, trees, wind, hidden defects, uncertainty of known defects.
You learned an 'expensive lesson, cheaply', in that being way up a big tree is the last place you want to alone and clobbered by a heavy part of a tree.
I generally try to have the groundie take a couple wraps and tie-off the pull rope. This keep it out of the way until the cut is made, which isn't always immediate. Sometimes, its just storing the rope off the ground out of the way until ground felling, sometimes its for the top.
I was topping a doug-fir that had lost its original top. There was a dog-leg. Back-Lean over the garage.
My groundie, like so many groundie (that's part of why they're groundie laborers), wanted to take short cuts. Had he just followed the standing plan, and tied off the pull rope with a little tension, it couldn't have set back when he started getting swarmed by yellow jackets and I told him to run. The top set back (no wedge, as it wasn't big, and had a pull rope), and hinge started to tear, putting the rope where it would run over me and my flipline as the top was going to head for the soon-gonna-need-a-new-roof garage. I quickly responded by wrapping a couple stubs that were left below the topping cut in order to DdRT down, and caught the top easily.
Pays to be good at rigging your own limbs/ tops. Not my first time catching my own cuttings.
I always assert that my employees are the biggest danger to me. I can mitigate most things, and rely on skill and knowledge, but when the "Butt, I though..." happens...
P.S. The tie-off and mid-pull-line deflection is MA for pulling. If you are mid-span, you get the greatest effect. A second rope with a carabiner clipped to the pull-rope can allow you to get more mid-span when the mid-span is way off the ground.
The line angle and distance from anchor affect things. I don't know the amount of MA. Its effective. When you have a harder pull needed, the guys just sit on the line, no wrist strain. As the line is loaded, they can push down and shimmy out a bit (they aren't balancing on the line or anything). Sit on your butt, do more work than you possibly can with pulling as hard as possible with your hands.
You've maybe heard that Complacency Kills. A good one liner, like Conversations Kill (not focused on the situation at hand).