Because these things aren’t rigorously defined it is helpful to follow the convention rather than to go to the dictionary definition of a similar word. I mean surely you wouldn’t say something along the lines of “I often see socialists who aren’t invited to many parties, so are they really social?”
While "Socialist" has a relatively specific meaning, "progressive" has a much wider variety of similar meanings, which definitely include the usage I indicated, without any need for recourse to the related word "progress".
Attempting to now restrict the word "progressive" to just one of its meanings in a politically biased way reeks of newspeak style attempts to control what people can express.
Well, I’m fine with definitions-as-description, but it doesn’t really leave me any room to call you wrong. All I can say is that I’ve never encountered anybody else who uses your definition.
