Sorry, guys, but you're wrong about the USA based compilers of the 80s. I knew / still know most, if not all of them. I can tell you that at the time, it was nothing more than "let's put out what we feel are really top-shelf sounds". Most felt they could make comps that were better than the Pebbles series content. And that's all that was involved, really. There was no serious thought process other than the selection of songs. Open Up Your Door Vol 1 had songs that were originally on a cassette dub from the 45s - the running order was randomly put together, and when time came to do the comp, they kept the same running order. Chris Peake did not carefully plan out "Psychedelic Disaster Whirl" to the point of creating song flow. Maybe putting his favorite song 1st on the LP, I think that's what he said when I asked him about the comp. All these guys were feeding off one another to try and out-do one another's efforts. Peake said he wanted to do a BTFG type comp, only with more fuzz. He didn't have the resources to track groups and obtain photos - he just slapped the comp together with several BFTG rejects - songs Tim thought were too psych, I think that's what he told me at the time.
The only person I will agree 100% on the "soul of the compiler" theory - The guy whose "spirit" comes thru on any comp is that of Tim Warren, as he completely upped the ante within the '60s garage comp scene. For better, or worse, all compilation efforts done afterward were measured against the Grave ethos. BFTG established what the 'punk' tag signifies with regard to obscure '60s recordings, had impactful liners (whether truth or fairytale), pics of performers and high musical quality standards. Any repressings were done to upgrade the sound, if not to revise liners and add pix. And Tim was concerned with song "flow" more due to the fact that he set such a high standard for himself.
I personally think the song flow idea is over-rated and meaningless - I mean, if you are a fan of the music, shouldn't you be listening to each song as an individual entity? Does it really make a 'flow' difference if "Like A Rolling Stone" (Soup Greens) or "Crackin' Up (the Wig) was the kick-off song on side 1 of a Pebbles volume? No. They are not works of the same performing group - THEN song flow is a different argument. Song SELECTION, on the other hand is obviously the most important element in putting a compilation together, especially in modern times - why do you think Debris is a freebie download? The compiler knows he won't be able to sell them to anyone but comp die-hards, for starters.
During my younger days, I did not think of the comp before the song itself. The comp was a just a storage LP for the tune so I could find it easier. I wanted to hear everything (still do!) no matter how strong, weak or pedestrian, so I bought 'em all. But I also had randomly compiled cassettes, like the circulated worldwide Never-Ending Trip series. 95% of the time I ended up recording songs from various garage comps in random order so I could listen elsewhere. But my focus was to obtain the original 45 if possible for the sake of sound quality.