Depends on the app entirely, for some things 2 fps is fine.

Being able to run two images per second through a post-processing and/or computer vision pipeline still sounds pretty useful to me.

Shoot, Blender still supports users without accelerated graphics. (Or did five years ago, things may have changed.)

The "2fps" example was an arbitrary hyperbole that by itself is worth nothing as a claim or statement.

Moreover, it's not up to you to decide what's acceptable or not to a 3rd party, specially if your claim is being made to justify choosing between being able to use something that performs below par or not be able to use it at all.