Midships is the right place to get on and off the boat if the sea is up.
We have a fold-down transom platform which is lovely when it's calm. But it becomes a death-trap with any waves, just waiting to bash you over the head
and kill you.
Our boat came with a lovely stainless ladder which could be mounted either on the transom platform, to form a swim ladder, or midships, for boarding from a pontoon or from the dingy. Unfortunately, a crewman dropped it overboard
in Weymouth Harbour a few years ago! I've had a new one made which I hope will be ready next week. 'Spensive!