There are some features found on today’s binoculars that we take for granted. Full multi-coating (for maximum image brightness), phase-correction (for better resolution on roof prism binoculars), waterproofing (for all weather use) and more were not common binocular features in past decades and, even when available, were very expensive options found only on premium grade binoculars. Yes, all of those standard features on current binoculars were once available only on the best binoculars, but all can now be found on binoculars well under $200.
As an eyeglass wearer, all my life, the one binocular feature I most appreciate as now easily found is long eye relief. This binocular feature allows you to keep you to wear your glasses when using a binocular and still see a full field of view. Back in the 70s, 80s and even well into the 90s, it was a real hassle to find a binocular with long eye relief. This was especially true on compact binoculars. Indeed, it has not been that long for even premium compact binoculars to have long eye relief. What a relief (okay, bad pun) it has been to be able to get a compact binocular, such as that Leica Ultravid BL 10x25 or that Nikon Premier LX 10x25 that now offers enough eye so I can keep those glasses on my face, where they belong, rather than taking them off every time I want to use my compact binocular. After all, the whole idea of a compact binocular is convenience.