Colnago CLX3.0 bare - 15.8 lbs
Lemond Zurich bare - 20.3 lbs
Douglas Vector with seatpack. - 17.4
Douglas Ti with water bottle and seat pack. - 20.3 lbs.
Eddy Merckx with bottle half full and heavy seatpack - 20.8

My 2018 Trek Emonda bare was 17.5 lbs.

As you can see, aluminum bikes do not necessary have a weight penalty. Nor are titanium bikes particularly light.

I would say that since about 2001 that most decent bikes couldn't be declared as "heavy". The complete Look KG585 which was a light climbing bike was 16 lbs even bare.