If your system can't be tested end-to-end because of how slow and flaky it is to test that way, doesn't that say something about the quality of your system rath

If your system can't be tested end-to-end because of how slow and flaky it is to test that way, doesn't that say something about the quality of your system rather than the tests? Of course once you have such a system, it's probably the result of years of work by many people and most likely it would be hard to make it faster and more reliable. That is probably why people shy away from doing that, and choose to blame the tests instead.