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Your request would be perfectly reasonable if this was something like Netflix where you can just quickly watch all the movies that are due to expire. What were you planning on doing if Spotify gave you warning that an album is being removed? Binge listen to it on loop then totally forget about it when it's gone? The fact is advertising that songs are being removed is simply bad publicity and bad for business with little benefit to the end user. When you realise the song is missing you're either going to buy it, pirate it or ignore it, all of which don't require a pre-warning.
This happens from time to time. In my experience the albums come back again after a while. Some stuff I was listening to recently vanished from both Spotify and Google Music at the same time. It's been gone for two weeks so far.