That's true, but adding a release lever would only mean a new mold of the same release part but with a perpendicular extension piece (lever).
You could still release it the same way they do now if they did add the lever, if you preferred.
The actual release piece would be exactly the same but with more material so it could be pulled directly form outside the ratchet housing. It wouldn't change the performance of the ratchet one bit. It would just give it an easier way to open.
There already is an easy way to open it. Pressing and lifting simultaneously. It's just as easy without the lever as it is with it. Just some people for whatever reason can't seem to figure it out. Low IQ? Who knows.