It isn't my method, it is Kuterlite's method.try your method on a 54mm comp fitting and get back to me..
Over the years I have made quite a few compression joints ( including fully pumbed two houses ) and I can only recall having to re-make one or two of them. I have seen several leaky joints in one house plumbed by professional's using PTFE tape in compression joints.
As I was making sucessfull compression joints long before the internet was set up it could not be google knowledge that taught me.the armchair googlers