It appears (a guess) that Acrobat Reader, Standard, and Pro are now all the same application with features unlocked for paid versions. But there is still the problem that Standard and Pro users need to be able to use the limited Reader features at the same time they're running Standard or Pro for checking/testing their PDF work or for other reasons. Also, for some users, different features (Reader vs. Pro) for different logins on the same computer.
It appears (a guess) that Acrobat Reader, Standard, and Pro are now all the same application with features unlocked for paid versions. But there is still the problem that Standard and Pro users need to be able to use the limited Reader features at the same time they're running Standard or Pro for checking/testing their PDF work or for other reasons. Also, for some users, different features (Reader vs. Pro) for different logins on the same computer.