I don’t use it, but I know people who do. Waveform dB doesn’t exist any more?
Koz
It still exists, but the option to select it has moved from the track’s dropdown menu, to the vertical ruler’s right click menu (NOT my idea).
https://manual.audacityteam.org/man/audio_tracks.html#scale
I never liked that idea either. I don’t think it’s very “discoverable” in that context menu.
And it’s confused a fair few people, particularly in Paul’s Facebook VO group 
Peter.