By showing an example of 2 different gamespaces I oversimplified the example to illustrate a point without having to list every type of player and unnecessarily write a Tolstoy's War and Peace length novel to highlight the issue, while showing a two part example makes the valid point. Simplifying does leave an opening for an overly on purpose literal interpretation which leads to classic and equally on purpose misrepresentation.
In reality, games have more than 2 gamespaces, and can have as many as needed. Water makes things wet. The sky is blue on a clear sunny day.
For those inclined to be so literal, there is precisely and exactly zero coincidence that the MMOs succeeding the most right now are the ones that are a theme park full of isolated sandboxes. There is also the same zero coincidence in knowing the ones that fail the hardest attempt to cram all their players into the same gamespace, then wonder why the vast majority of accounts have less than a full month of log in time (not play duration mind you, but time between very first and very last log in). When the surveys roll in, there is also no coincidence (see the theme forming here?) that single biggest reason for leaving by far is "community toxicity"
False, but Im not inclined to out several companies data to win an argument on the internet. Our team has seen, analyzed, and done the homework on this subject. If you believe this to be incorrect, feel free to let us know why the single most recognizable IP in RPGs in the last 40 years has a fraction of the players many cookie cutter clone MMOs have, a fraction of the players another D&D themed MMO that is a much worse representation of the franchise has, and also a fraction of the players this very same game once had. "Old game" doesnt work here, because I can name several older games with multiplicitively higher player base concurrency. "Bad grafix" also doesnt work here either, as with this 80s reboot era we are in the middle of, companies are making pixelated graphics games on purpose and they sell like hotcakes. They also dont have system requirements just shy of Pixar's render farm to play on medium settings.

Heck I can name games with worse graphics that are far older, that people left this game to go play.
What are those games doing correctly? Multiple gamespaces for different minded players. This is not a new concept in multiplayer game design, after all.