you seem to be intentionally downplaying the dangers of this software, under the guise of pedantry. please stop.
In turn, I do not see people complaining about Firefox storing all your browsing history in plain text, your chat history in cache files, so on and so forth.
Probably because Firefox doesn't do this. Firefox's cache is very predictable, and does as it's told: most chat services do not result in information being stored in the cache, once you end the session.