Except the identical problem exists with physical CDs, many different versions with quality all over the place. If anything, it's easier (and a hell of a lot quicker) locating the 'good' versions via streaming than trying to physically locate the best CD versions.
No. Firstly no streaming service have the older first mastering that was released on CD, only the newer. And secondly, there is a lot of info online what version is the best and then one can get it.
I find it funny that a forum that are so anal about measurements don't care if the music one play is dynamic compressed by 3-6-9 or even more dB and have big EQ changes.