The other main point in remastering/remixing/reissuing older recordings in any format....is to keep these glorious recordings available for future generations....Digital technology will help this, sure there are still some things that digital does not do good, but it is getting better.
Some of these reissues are being done because the original recording/mastering were not done well. Back in the early 70's audio gear may not have "shown" these inadequacies. But with today's advanced audio gear, especially digital, it's clear these recordings are pretty bad.
Steven Wilson is just one of these guys taking great care to bring out more of the music that is hiding on some of these old tapes, Nick Davis is another one. His remixing work on the early Genesis albums is stellar....
Whether you like to hear your music on audio gear that brings out all the small nuances or tidbits or every sniffle of the musician, or if you are fine listening thru 2" laptop speakers.....Does not matter, but having these recordings around for possibly forever is very important.