I am a bit perplexed at your claim that end-to-end tests are not fragile in general (my claim) with a counter how you spent a decade on not making them fragile

I am a bit perplexed at your claim that end-to-end tests are not fragile in general (my claim) with a counter how you spent a decade on not making them fragile in one particular case? I am not disagreeing most projects evolve test suites which have duplicated, useless tests as a majority. But it can be done better.