FWIW I've used my Canon macro lenses in minging weather and not had problems....neither of mine are L lenses and probably fairly similar in how they are sealed to the 60mm.

A case is no use if the lens lives in a camera bag or on your camera and a lens hood is no use with a macro flash on the front. I wouldn't want to pay for stuff I didn't need so good on Canon for not bumping up the price with pointless frills that not everybody needs. If you want a case, hood and tripod ring then the Canon 180mm L comes with all that.

The Canon focus ring doesn't need to be able to change direction as it goes the right way already

Either way the Oly lens tested is just a pretend macro lens since it doesn't do 1:1 so the bells and whistles are insignificat IMO. (I think Nikon use the right term of "micro" for less than 1:1)

Does the Oly 50mm come with a lifesize convertor?