sets
I understand why they’d bring them back. In current D4, character building is relatively opaque, in that building a very strong character involves knowing if things scale perhaps somewhat unintuitively, knowing if something double dips when you wouldn’t necessarily expect it to, knowing that the description text really doesn’t fully describe the way something works, and/or knowing if something is bugged.
Simply relying on in-game information, as it’s presented to the player, will get a new person into current T4, but their build will probably do a fraction of the damage that real builds do. If they’re willing to spend days testing stuff and recording it in an excel spreadsheet, they’ll obviously gain more accurate information and potentially end up with a stronger build, but nobody is buying Blizzard games to play spreadsheet simulator. That’s why everyone goes to Maxroll, Icy Veins, or YouTube – to get info from people who spend literally all day in a discord, testing this stuff.
PoE players have Path of Building (a software program developed by a guy who became a PoE dev), which will give users semi-accurate information regarding character damage, effective health, etc., so that community isn’t as reliant on in-game testing for all their information. Even with that, players generally aren’t making their own builds, and they instead rely on builds from content creators.
Sets allow the devs to more or less hand the players builds, so I can see the appeal from a development standpoint. I’m not saying I believe they’re necessarily a great idea, but there’s probably a strong argument that sets aren’t any worse than players getting their builds from a 3rd-party website.
The biggest issue, imo, is still bugs. You can hand players a set/build, but if it’s bugged or the skills it uses are bugged, you still end up with players not being able to make accurate decisions with in-game information.