Fascinating thread, thank you to all that have contributed 👏 @Stephen Waldee you will find SGL a very friendly and open to nearly all opinions, so nothing to worry about there.
Very interesting articles you have shared there regarding dark sky adaption and filters, really nice to hear it is from personal experience.
The idea of preserving the "night vision" of your eye piece eye (that looks odd 🙂 ), is something i have also done on many occasions. The difference even after a short time in my light polluted garden is remarkable. One of the big mistakes also, is observers do not spend enough time on one object. As @Stu said "pop a filter in and everything becomes easy to see. They obviously make things darker, but improve the contrast, so if anything dark adaptation is MORE important when using filters" is spot on!
As @Stu said one of the major problems we face, certainly in the UK is finding somewhere local with anything like dark skies. I went to Norfolk last year, not far from Kelling where Asto camps are held. The skies were amazing compared to what i have locally.
Thanks once again for the in-depth links, P.S are the "Astrogoggles" available in the UK? 🙂