Hi Fore, yes, when repotting every kind of tree you first have to look at the condition of the roots before you cut back. Most important aspect because at this stage you look for dead roots and all other root problems.
Naturally, with trees that don't like root disturbance you will follow a more conservative protocol as e.g. cut pie pieces out of the root mass and replacing these with new soil but you still need to inspect the exposed roots.
So in this case you have to comb out the roots first to see the root groups associated with a specific vein and not cut back blindly and randomly because you have to "balance" the root groups. So on a stronger vein with more foliage I'll leave a bit more root etc unless you want to strengthen/slow down another area of the tree. You can even go as far as potting a specific group of roots into a container of its own and then feed that contained section more than the rest to make the tree develop more in one area.
As I mentioned nature please look at old Silver Maples. You'll often see these veins on them as well.
Interesting is that I see what looks as if Kevin is cutting across the grain of the wood on the olive trying to make the spiral. As part two is still due I cannot point a finger yet but olive wood is very dense so maybe he'll get away with this.
But what the heck do I know lol
