I think 1st rates is to common and cheap in the first place 3rd rates should be the most common sol in pb with 2nd and 1 being rare and exponentially more expensive.
would be way more intressting if the bulk is 3rd rates while the 1st and 2nd is so expensive clans would se them as ships they need to protect and valuable targets to take out instead of pb with just 25 1st rates...
In reality even 3rd rates was to valueble to be lost and frigates ess seen as the largest ships affordable to loose