Well, a bicycle that wiggles on turn-in has a weak frame but the poster allowed for that.

Now, aluminum that flexs then cracks. So aluminum is used in larger cross-sections than steel. Allowing for the larger cross-sections then the weight advantage of aluminum over steel is only about 5%. However, current aluminum frames have smaller cross-sections than the original aluminum frames. Now the forks can be carbon-fiber and that helps.

Presently, carbon-fiber frames often have seat or handlebar compliance systems.