That's true, but the trouble is that if you look back to past elections, those polls are also wrong in very similar ways. They were just wrong in a way that overemphasized the success of the right candidate, whereas polls this year were wrong in a way that suggested success for the wrong candidate. So the errors have existed for a long time, and in fact they were lesser this year than in previous years. Polls are getting better, not worse - but the narrative has become "never trust polls again because they were wrong" when the truth is closer to "learn lessons from the polls because they got close but made serious missteps."