Looking at the update thread - https://www.pathofexile.com/forum/view-thread/3362856
Can't help but feel like they launched this league straight into the dumpster knowing it would be bad and never even considered addressing issues post-launch unless they straight up broke the game.
Which seems to have worked for them to a point - highest peak concurrency at league launch and retention appears to be solid as well (anecdotally feels like they've been doing more of a UA push on top of last league just being a damned good league) so whatever they're doing appears to be working given those metrics.