sam writes:

That is the one that I was looking for, but it seems like it is no
longer available. It seems like it was replaced by an indexing model.
Which leads me to ask how useful is variable speed and indexing. I
have never used a lathe, but have done a lot of wood working.

Indexing is useful if you want to replicate a non-lathe pattern around
your piece, like drill holes every 15 degrees.

Or you can use it to hold the arbor in place as you remove a chuck.