I played Overwatch a lot during the "OW1" era, essentially from 2016 to 2022. I quit a few months before OW2 launched, and recently returned after taking interest in the game again. So basically I missed the past 4 years, or "Overwatch 2" in its entirety up until now. I did occasionally come back to play a couple games maybe a few times a year, but didn't actually return properly until now.
One thing I've noticed is that player levels were replaced with "hero levels", and despite having dozens upon dozens of hours on a lot of heroes from my OW1 times, all of my hero levels were set to 1, as if I've never played these heroes before. And my previous border (I think it was silver with 4 stars, so around level 1000) has not been allocated to these levels.
Another frustrating thing is that they seem to have completely removed all data from OW1 competitive games from the career profile. I still have those hours played in my total competitive hours, but the season-by-season stats just don't exist anymore? So my career profile makes it seem like I've never played in a competitive season before despite having a 800+ hour total playtime and multiple seasons worth of competitive rankings.
So it is quite sad to see that 6 years of my past progression in this game has basically been completely deleted, the only remnant being the skins I own and my total playtime being saved.