All true. We've discussed the idea of content packs for these, particularly as we continue to add more capabilities in the future, but it always comes down to retailers. Asking them to dedicate space to add-ons for these things is not easy. They pretty much give the space for the stock units and that's it. That's why you also don't see the wired controllers anywhere either.
RE: paddle games, at least they will still work with the d-pad automatically.
Just in case anyone missed it earlier, please keep in mind that the SD card slot enables compatibility with maybe 60% of the Atari 2600 library (my estimate; I'm sure we'll get better numbers if there's ever a concerted effort to test every possible game). The emulator was unfortunately not tuned for anything but the built-in games, so whether or not it will work with something is hit or miss.
I definitely view the SD slot as icing on the cake...But I appreciate the way you've spelled it out here for some people who may not think the same way, or who were banking on it having greater compatibility...