Good to know. I'm paranoid of manipulating my follows with new clients and have been using Snort for that exclusively.
It should be straight forward to write a service that detects these loss-of follows events. If you are working on such a service, I would not consider it spam if you DM me with an offer. "Hey, could it be you just accidentally unfollowed nostr.build, Jeff, Peter and 150 more? Reply 'help' if you want us to help you out." It could offer a list of npubs or a tool to fully consolidate the follows list for different prices.