Idea for an Amphibious Unit

I find troop transports already quite OP in the normal game. A stack of Inf troop ships does a lot of damage and slows down your naval forces significantly.

So boarding crews essentially? What if they had the strength of normal infantry on land, but could capture enemy ships?

Horrible idea. There has never been any such thing as assault infantry that can attack ships, it would just be a ridiculous fantasy unit.

I would rather have airborne units personally

Actually, boarding parties were a staple of naval warfare until the end of wwi. So you are incorrect, it is not a fantasy unit.

Quote from Haakon III

Actually, boarding parties were a staple of naval warfare until the end of wwi. So you are incorrect, it is not a fantasy unit.

How many WWI naval engagements were won by "boarding parties"?

There were very few wwi naval engagements in the first place, but, during the Russo- Japanese war, which had several naval battles, boarding parties were used by both sides.

An examlpe

Another one: