Effective level is nice, but also remember that effective level doesn't do anything to determine performance/impact a team's ability to win:
"Effective level rates players by comparing the total value of a player's abilities to the average value of all players of the same position at that normal level."
So, if you're building a player for a particular purpose which may be unique as compared to other players at that position, then it is not to say that a lower effective level negatively impacts that player's effectiveness. In fact, as long as you envision exactly how you plan to use the player, and build the player's attributes in accordance with that plan, and gameplan in unison with that player, then the player will still be effective.
"Effective level rates players by comparing the total value of a player's abilities to the average value of all players of the same position at that normal level."
So, if you're building a player for a particular purpose which may be unique as compared to other players at that position, then it is not to say that a lower effective level negatively impacts that player's effectiveness. In fact, as long as you envision exactly how you plan to use the player, and build the player's attributes in accordance with that plan, and gameplan in unison with that player, then the player will still be effective.