I won't advise using artifacts strongbox simply because you can feed those artifacts as EXP to other pieces. Let's assume you want to feed some artifacts and get other pieces in return. Now, what if they aren't the desired substat you want. At the same time, this may be good for people who don't have enough time to play and want the given artifact pieces on their characters. They must sacrifice some artifact pieces and complete their collection to achieve that. I would say this feature acts as a double-edged sword. On one side, you can get the pieces you want from the system, but on another side, there's no guarantee about the substats, main stats, and wasting precious EXP. You can only convert artifacts into a few different sets, so you are limited on the builds you can create when using this system.