feel free to complain to half the devs/publishers that called them episodes then.
That's just being silly. "episodic delivery" is a compound term. It's
meaning is that you buy the game in installments. It's a payment model. episodic delivery is a model based on the difference between weekly TV and cinema. Episodic games release many game sections per year, rather than one game every 2-3 years, and you choose which episodes you want to buy, or you get a subscription which delivers you the episodes as they are released. It's exactly the same as having either one big movie release every few years for your favorite franchise vs watching one episode per week on TV.
Many games call their sections "episodes" (heh, semantics and all that), that doesn't mean the same thing at all. They're delivered to you for a one-off payment that delivers all "episodes" to you in one hit, which is the opposite of the episodic delivery payment model, where you get ongoing access for a subscription.
I do think that for companies like Apogee, which developed games according to the "1 episode shareware, 2 others order" system, it impacted the quality of the games in the later episodes due to dragging the premise on for longer then it needed to be. A lot of the variety was in the shareware episode while the later episodes had more repeated content.
Well, you'd already hooked that person to buy at that point, and the word of mouth was all around just the shareware version, since the vast majority of players only had that version. It meant that the quality of the full version wasn't what was selling the game, and after the demo the company was best off churning out shitty levels for the full version, then focusing on what would sell more games - an awesome next shareware demo game.
I think the modern idea of episodic delivery was only really possible once graphics became good enough that you could keep the same look going for a long time and not have people screaming about the shitty out of date pixel art. That wasn't really possible with 80's / 90's gaming especially when screen resolutions started to increase exponentially around the mid 90's. Right now we have 1920x1080 and most people probably aren't going to care about anything more than that for quite some time.