Thanks for the comments Bill.
I’ve made the “really simple” version into a “Tone and Volume” effect and posted it here: https://forum.audacityteam.org/t/really-simple-tone-and-volume-control/16987/1
Yes it’s limited, but I think the simplicity could be just the thing for some users.
You’re right though, the “really simple” version could not replace “Bass Boost”, but I think that “Bass/Treble” could.
(it’s just a shame about the Normalizing issue) 