I was thinking about changing my PSN ID from the browser, although I'm still playing in my PS3 as I don't own a PS4. Do you know if it's going to affect the game progress data, paid-DLC content etc there? Will the new ID be recognised as a new account or something like that?
I did some research on Reddit (specifically
here) and I saw many people saying that the PSN ID change doesn't affect anything related to saved game data, game progress or downloaded content of the PS3 games/apps. I can't confirm the same for the PS Vita, but the same claim might apply. It
may stop the trophy progress though, a.k.a in case a trophy is earned after the PSN ID change, it will not count towards the trophy progress, despite the new ID name being "accompanied" with the same basic account, if that makes any sense.
In the end, I changed my PSN ID from the browser. I'll give you some feedback in case I notice something wrong or abnormal. 👍
Edit: I checked some of my games like F1 2013 and Battlefield 4.
Nothing important has changed, the DLC for each game is still there, the game data files are as they were before the change. I noticed that my previous ID name in the leaderboards has been replaced by the new one.
So, everything seems OK, I guess