Yes, you can. But, the tier list assumes that you have all units available. A character like Shenhe or Albedo can be good or bad for your account, depending on your existing units. With how difficult it is to get every unit without spending money, most players choose characters they like or want and pull for them. You should base your decisions only on what would offer your account the most value, and of course, you should never stop yourself from pulling units that you like based on their personality, gameplay, or aesthetics.