I prefer a key because:
1) Less can go wrong if they get wet.
2) They're less bulky in your pocket.
3) Even if the electronics are totally shot I can still get into the car.
4) I can get a plain metal (zero electronics) key for just the doors and glovebox cut at the local hardware store and take that out on the water with me while leaving the real key locked away in the glovebox, whereas the little emergency keys in fobs are tiny and hard to use (and easy to lose) and usually laser-cut so you can't go get a regular one made easily.
5) I can easily leave the car running but locked to keep the AC going for my dog while I pop into a store if necessary, again taking my hardware-store-cut key along. Some of the fob systems seem to freak out whenever you try to leave the fob behind, not letting you lock the doors with them inside and such. I'm not really sure what Subaru's behavior is for that.
It's super annoying that Subaru makes the keyless access / push-button start required on higher trim levels. Make it the default all you want, but give me the option to "downgrade" to normal keys please!
1)actually a lot of new keys have electronics in them and can't get wet. I'm pretty sure my bare bones 2005 Xterra key even says not to submerge in water.
2)debatable it is easier to have a key fob in my pocket then a key with a sharp edge that can jab my leg.
3) True but I think all have manual overrides or else you can't get in if the battery dies.
4) True as well and while your situation might need that the majority of people seem to not care about that. Counterpoint you can always have a watertight compartment that you put the fob or key with your stuff that floats so you don't loose it. Or buy a Land Rover Discovery where you can get a waterproof band that can unlock the SUV.
5) Partially true but that is also car dependent. I think my wife's car I was able to lock without a key fob in the car with it running.
Last point is that most other manufacturers are moving towards this system and Subaru is following this trend. The truth being is that most people want it. I can understand that you don't but most including myself do.
I will say that I thought these were ridiculously stupid when my parents got it in a car in 2005. It was part of the tech package so forced upon them with other options they wanted. After about 6 months they only drove that car because of how convenient it was to not have to take out a key anymore.