What is unprofessional about it?
I work for a very large bank. Quarterly we make updates to our online site but don't release "patch notes" and we let our customers experience the changes on their own.
Those that notice them love it and those that don't notice them know nothing about it but either way it has no ill effect on our customers that we don't notify them of the changes we make no matter if they are minor changes or major changes.
Again, if it's something you benefit from, you will notice it, if not, you won't. Still not sure what the difference is if you don't get patch notes.
Edit: And furthermore, to say a company that is trying to improve a product you've ALREADY BOUGHT without providing specifics as unprofessional is just downright silly.

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