So, normally we can only see an allies current health points, and have to guess about Max Health. But when Shard of Power is in play, suddenly we only get to see the allies' Max Health values, and have to guess about their current health values?

What's up with that, and why doesn't the card say this in an explicit fashion?

Better yet, why don't all cards show current and max health e.g. 1/4 ?