The same reason irregardless isn't a word.
Granted some words can "become" words, it doesn't mean we should take extreme liberty with established linguistics
The english language is dumb as fukk.
Irregardless doesn't even make sense breh, but I can understand why people would use conversate.. But basically it's the same reason informating is not a word, you say informing right?
Information - informing
Conversation - conversing
Nothing in the english language makes sense.
Blue/blew
???