As many people, as many opinions. but you know, it reminds me of what I did with my Acer buergerianum :
2019:
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May 2020 :
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I think maybe we should ask him.
cool. if was mine i would of been tempted to cut back even harder in some spots.
even the tree in the video needs a lot more work. many branches have no taper and are still too long even after the big reduction, but yes we dont know, it could be a progressive process he's working on. but as you say, in his climate he can get away with more, therefore i might of been more ruthless.
a few years ago, when i was mad about elms, i had this little shohin elm and i messaged Boon on FB on how to get it to look like some of the shohin elms he was sharing on FB. he said that i needed to take back every branch to around 2in. this 2in has always stuck in my head ever since. straight sections of branch longer than 2in never look right imo, just me. if i can i will apply change of direction/taper. it bothers me now if i see these straight sections on other trees. sometimes it works and other times it doesnt, usually it doesnt but sometimes you can wire in movement, but i prefer angular movement where possible.