Not sure how many who have read or responded to this (great and relevant) thread are busy working pro's so I will add my 2c worth.
Luckily I am busy working and from that point alone LR6 is a complete waste of time in it's current 'beta' state..
To buggy, very 'half finished' no new processing engine and there is no way I would convert my existing catalogue to LR6. I cannot risk losing work, the type of work I shoot doesn't use pano or HDR, in fact with an MF back or D810 you don't need HDR.. I don't need face recognition either so although I upgraded to LR6 and installed it (I don't need or run CC)... LR6 is just sitting there unused, save for a quick 'test' catalogue I tested it with one slack Sunday.
I have been a long time supporter of Adobe and often spouted how over the years their S/W has been the gold standard by which others should be judged, especially in terms of release bugs, and giving us 'tools' almost before we thought of them.... (heal,patch tool... content aware fill etc...)
LR6 shocked me in so much as it gave us 'nothing' real, just a few sprinkles that 'might' apply to some... It does seem that it was a forced release, for whatever reason, and the obvious push for CC seems a little too one sided, more an immature money grab.
If you look at the last few iPhone updates and their 'own' map,,, it all smells very similar, too many number crunchers at the top who know very little about real users leading real lives... If we add Windoze 8 into that mix too......
As the famous saying goes....'if it ain't broke... don't try to fix it...'
From a fast, reliable work turnaround LR5.7 and PS5 work very well for me and long may it continue...
S