This is probably because I am in a better financial position than I was when I was younger, but I personally would not have minded a third option, like PS4 Ultra, for about $200 more and 4k no question gaming, But with the PS4, PS4 Slim and PS4 Pro, market confusion would have been rampant with this fourth option, but I do still hold out hope, companies get more on board with tiered systems like this, force all games to work on the base original and then those that want their eyes to be touched gently can pay for higher end models.
Thanks jlmurph!