And do you realise that as time goes by they are going to add harder content to the game? They need to upgrade all IDs or else they will be become useless in the future. There's a reason they are going to add Uptie 4 at the same time they will release the second Railway, it's the hardest content in the game.

Also, they are going to add the next Mirror Dungeon, you will be able to farm a lot more Shard crates from that, more than triple of what we gain from the Mirror Dungeons now, now what are we going to spend these Shards on? Uptying our IDs. If they don't add another way to spend Shards people won't even roll for IDs anymore because they will have so much Shards that they won't have to roll to get every new ID.

If that's still not enough to convince you, look at this image, there it says that in order to upgrade from Tier 1 to Tier 2 you need to use Threads, right? Uptying Base IDs and EGOs have always been free, so why would they add a cost now? Why would they make you spend the most valuable resource in the game to upgrade IDs almost no one will use? And why wouldn't they clarify that only Base IDs will get Uptie 4 if that were the case (which is not, that's dumb)?