Personally, I wouldn't mind if the ef-themes were added, I'm just not sure
about the large-to-me number of options available. I guess a lot of people
have that problem.

I did also notice that the ef-themes don't have any descriptions when using
(M-x customize-themes). They simply come up like the below:

==== example buffer ====
...
[ ] ef-summer -- (no description)
...

If the individual themes are loaded with M-x ef-themes-select, then their
description does turn up in the customize-themes listing for each theme
loaded (and presumably then cached), shown below:

==== example buffer ====
...
[x] ef-summer -- Legible light theme with magenta, purple, gold, cyan
colors.
...

I don't know whether I failed to follow some installation instructions when
I installed them.

Just my NZ$0.02

Regards, brickviking