If your balance assessment in any way draws on your own personal ingame experience then your assessment is influenced by your skill level.
Your rank is a measure of your skill level and your rank is therefore relevant as a measure of how reliable your balance assessment is.
If your balance assessment is in no way based on your ingame experience then your playercard isn't relevant.
Rank is not a measure of skill level. It is as simple as that and thus rank is irrelevant. Currently Cruzz is not in the top 10 ten 1vs1 with any faction. Does that is his balance assessments less reliable with when he was?
Let me try to explain this to you with an example:
2 players start playing the game at the same time. Player A like competition so he check what the current meta is and learn who to play it.
Player B is player who likes to play a game and have fun and like to learn things. He check the stat of units and tries using all of them.
Obviously player A manages a higher ladder position but his opinion can hardly be considered better since his knowledge of the game is limited and he has not actually tried to see what thing work and do not work and why.