I think modern medical ethics demands a physical treatment for literally everything and anything that's discovered, including quite a few that either aren't physically dangerous (e.g. atypical brains) or are inevitable (a 90+ year old with a laundry list of conditions). And, as other comments have pointed out, a panicked surgical response to a mammogram isn't based on time series data.
I totally understand and agree with trusting that medical professionals "know better", but I also would not conflate current practices with absolute perfection. It's clearly not a perfect profession or practice.
You don't have to conflate current practice with perfection. You just have to bother learning what the current practice is and why - and "it's just so rare to know anything" is not the correct answer. Just to start with basics: yes, actually mammograms are analyzed using time series data of a patients previous scans!
I totally understand and agree with trusting that medical professionals "know better", but I also would not conflate current practices with absolute perfection. It's clearly not a perfect profession or practice.