Draw would work better if one could use Splines and Lines instead of manipulating individual samples. The only thing that I could use draw for was to interpolate a single sample, at for instance the join where I copy and paste.
So interpolation is the main point of Draw, but one cannot do it smoothly enough. There is another tool that will interpolate for you.
If a click is in the middle of a held note, the waveform on each side will be similar. At first I would try to draw a matching wave. Then I started to copypaste the wave on either side to match the pattern. Draw would be used to interpolate at the joins.
I discovered that silencing the click can cause a click of its own. Maybe I wasn't following the five millisecond rule.Most discrete clicks up to five milliseconds long can actually be simply silenced without leaving an audible gap in the sound, although many spread wider that that. If the click is not suitable for silencing, try using the Draw Tool by clicking the pencil icon top left of the Audacity screen, or press F3 on your keyboard.
Right after this is instructions on how to turn the draw tool into a brush. I missed that part. That would have helped with my complaint that I can't draw smoothly enough.
But now repair can do both these things more smoothly and easily.