I've had several yachts, from centre cockpits, to closed transom, to open transom - and they were all great.
But do you really think you get crocs in an open transom in Oz? Someones having a lend by putting that story about.
Do things fall out an open transom? Gguess they could, but not once on ours in many years hard sailing.
Are they quicker to drain if you take water (from forward as well as aft)? For sure.
Do they give easier access etc when parked up? Obviously yes.
Do they make it easier to get pooped? IMHO unlikely - as most open transom yachts have more volume in the stern leading to them being lifted by a following sea. I've never been pooped in maybe 50,000 miles sailing.
But its fact that having the two rudder
stock bushes closer together does mean the loadings are greater, so that part of the yacht has to be built stronger, plus a shallower cockpit will always feel less secure in a big rolly sea.
We all have our own views on whats best - but IMHO its best not to perpetrate folklore just to try and justify a view. Best stick with facts.