It makes sense if you are planning on living somewhere for a long time, but it blew my mind. In my experience people didn't even move their appliances when they sold their house and moved to a new one.
Also for some reason they love integrated appliances. It seems their biggest fear is someone walking into their kitchen and finding a fridge there.
Also, these days a nice kitchen is an important status symbol for when you have guests over. So many Germans prefer to get new and personalized kitchen equipment when they move in. Knowing of course that later they will be able to sell it at little loss.
If the latter, sounds like good business for installers!
Is there a rationale or just habit?
My place had a kitchen with fridge when I moved in. A lot of places on the market now have too. New and renovated places often don't have a kitchen, but there are some that do. When you rent a place that had a former Tennant you often buy the installed kitchen from them.
That's the situation I experienced in Munich since 2009 - may be different in other places and may be changing from how it was before.
There is definitely a growing amount of places coming with a complete set of furniture - but that's just a trick to increase rent. It circumvents a law that regulates how much more expensive you can make a place for a new Tennant. Everybody hates those places.
But even with a kitchen, apartments are very bare indeed, no built-in cabinets or wardrobes, no curtain roads, ...
Are you from the midwest? This construction seems to be regional. Say this in much of the country and they'll wait expectantly for you to finish your sentence.
Note though that a lot of apartments come with dryers. Apartment buildings' bylaws often preventing hanging washing on balconies, so I suspect they're legally required to offer an alternative.
I have never found anywhere more exciting than Whitehorse on the planet - IF you LOVE the outdoors. It's paradise.