Yes, I'm a bit perplexed as to how its always just one more lockdown to get Covid under control, but none of the lockdowns have ever succeeded in getting Covid under control.
The first lockdown did exactly that. Infection rates and deaths were very low in Summer. It did exactly what it "said on the tin" it would do. The November lockdown also reduced numbers, but it wasn't long enough to reduce numbers to low enough levels. The graphs of both infection rates, hospitalisations and deaths show the lockdowns worked as planned.
No one expected the lockdowns to "cure" it or eradicate it. Right from last March, it was clear that restrictions and lockdowns were to keep the infections, hospitalisations and deaths down to manageable levels until the vaccines.
Surely you havn't forgotten all the media coverage, daily briefings etc that talked about reducing the peaks.