I'm not confusing anything. Its very easy to switch to a new set of xpubs anytime among other techniques if you fucked up that bad to start with. no he didnt fuck up, how do you know those are his only xpubs? Start9 is free. Just download the image. its also more secure. Umbel uses http.
Not that easy. One of my wallets has over 1500 UTXOs, all carefully curated, isolated, consolidated, labelled over the years. You don’t just hit the nuke button and sweep to a new xpub like changing a show on Netflix.
In this case you should have followed best practices from the start. Now you will have to curate all over again yes. Education is important.
If you make a fuck up, how does moving to a new xpub help? There is no backward facing privacy. It’s just a series of breadcrumbs to new addresses. Only way is to coinjoin and that’s fast becoming a dead duck. You can’t erase history. Bitcoin wasn’t designed to be private or anonymous and we shouldn’t assume otherwise. It’s got so many advantages of other forms of money but this area is a real weakness. Satoshi wrote about this extensively.
hey if you screw up, you have to take certain measures. There are even easier ones, ie: over the counter non-kyc cash exchanges, Bitcoin Lightning, swap to an altcoin and back. these are the tradeoffs for not RTFM its not bitcoins fault, its yours!