Yay, time to attempt a counter-argument
1) Centurions are W2 Infantry whilst Dreadknights are W4 MCs. Considering this unit combined the two, I figured going between the two for wounds would reflect the size change, whilst taking into account ablative armour and non-fatal wounds.
2) Chainfists are still I1 due to Unweildy, and sacrificing 1 point of strength to attack at I4 doesn't seem like too bad of a trade-off. Another point to make is Chainfists are essentially just Powerfists anyway, both in modeling and in stats, whilst Siege Drills are a clearly different weapon.
3) Again harking back to the original Dreadknight, which comes with just two Powerfists in the form of Dreadnought CCWs. You have to then pay extra for your shooties and stabbies
Making it so the weapons are a pay-to-use also means that the price of the Dreturion vs its output MUST be weighed up by the player, rather than just thrown onto the field in the same way Centurions can.
4) Kept in more becuase I forgot to double check what MCs came with as standard, but also becuase I'd only be going by the 6th ed rulebook. If SnP and MCs haven't changed much I can have a better look now. Preventing them from running and disabling overwatch is something I'd need input from others about whether it is a good or bad idea.
5) Dreadknights do not have IALs as standard is may only argument. Making the Hurricanes free means a player can put a small amount of shooty output onto the Dreturions at minimal cost, but with twopwerfists or Siege Drills, those IALs could easily swing combat too sharply in the Dreturions favour. This being brought up makes me think the IALs should cost more.....
Thats just my initial thoughts in response to what you said