Having enough players for that doesn't mean they aren't losing players. You don't need millions of players for fast chats to happen consistently, a few thousand will do fine.
Nice assumption you have there, would be a shame if someone were to present some facts to counter it.
https://steamcharts.com/
While this is only for Steam, it has been proven time and again that things are proportionally very consistent across all platforms. If the player count for a game goes down by half on Steam, it went down by half for each platform.
Search for Warframe. In the top left corner of the player count timeline, if you click on All, you can see that Warframe's peak player count USED to be consistently going up. Now though, while inconsistent, it IS going down. Particularly, in September of last year, (October if you look at the list below, since that list checks from the 20th of a month to the 20th of the next one) Warframe's peak player count dropped to the lowest point it's been in 5 years.
Warframe may not be hemorrhaging players, but people ARE leaving, You're simply ASSUMING that everything is fine because you're just going "I'm able to win. Therefore, the game is good."
Here's the Catch 22, though: The backlash against bad design choices is almost exclusively voiced by the players THAT ARE STILL PRESENT.
Ever ask someone why they quit Warframe? Me neither, but I doubt that Final Fantasy 14 doing so well has anything significant to do with it.