Q. Is this really as harmful as you think?
A. Go to your parents house, your grandparents house etc and look at their Windows PC, look at the installed software in the past year, and try to use the device. Run some antivirus scans. There’s no way this implementation doesn’t end in tears — there’s a reason there’s a trillion dollar security industry, and that most problems revolve around malware and endpoints.
Do you really need screen snapshot to do fine grained search though? It sounds like you’re describing Spotlight in some way https://en.m.wikipedia.org/wiki/Spotlight_(Apple)
With recall you can search for a website you saw once, a link in a discord channel, an email all at once in one place.