Its the servers, EA are finished as a company in the medium term if they don't sort out the servers for the game. No Patches, no content can overcome poor quality gameplay due to delay. My first time back since Fifa 16, I'm invested in this years UT. But if they don't fix the unresponsive gameplay, I won't be playing next years for sure. I'd imagine its the same for 10000's of others.
I don't think they've reverted any changes or anything, they just provided additional server capacity for a time. Now its back to the normal cost cutting algorithm, where 84 rated players play the same as 95 rated.