The archons are incredible playable characters who feature a plethora of abilities without any extra constellations. I have Venti, Zhongli, Raiden Shogun, and Nahida, all without any constellations, and they have helped me clear all the spiral abyss floors easily. You can fixate them in any role in the team. Whether you want a supporting character, an on-field DPS, or a utility, you can rely on archons to do the same. Indeed, I highly recommend you to wish on archons and try to get them. I won't mind purchasing a welkin to stack up some primogems. Though, if you have some money, then do spend wisely. I don't advocate spending a lot of money on the game and have only bought one welkin and battlepass.