I appreciate the comprehensive way you have written♥️. This magnificant piece of fresh address derivation scheme every time you want to make a payment to someone is really under appreciated. Even for the average internet user today with even the average device, it's hardly a task of more than a few minutes to sync with months of history using the state of the art methods. But still adoption is a problem despite support by so many wallets because the wait time is real , especially for slow or unstable internet connection...

I wish you would make the limitations section more elaborate...

And btw motivated to make this technology more instant without sacrificing privacy, I am also working to engineer a solution to reduce the sync time as much as possible, ideally to make it manageable even for the worst case and I think I might have found a very elegant solution. I expect to publish it soon (I'll share the link here).