As a videographer with experience over 2 decades growing from SD, to FHD, to UHD and 4K, as well as some 5.2K, and doing lots of pixel peeping and various other forms of geekery as well as using it on full rez screens as well as others, editing, compressing, colour correcting, cropping, and all the things that video people do, I can tell you that not being able to "see" the full resolution is immaterial.
For instance: If I view my 4K or 5.2K footage on one of my HD monitors, I can easily tell the difference. The edges are more defined, the details are sharper (without false sharpness), colours are generally more realistic, and compression artifacts, banding, jaggedies, and other annoying faults are minimised .. they are, in fact, smaller, in relation to the bigger picture, so even if they are there (and they generally always are to some extent) they are far less noticeable.
4K resolution for 360 degree video is not good enough. 8K is minimum, form what I've seen. I've seen some 8K videos on YT, and while few and far between, it won't be long before there are many more. I bought a Skybox license so I could view Youtube (and other) 360 videos after downloading .. I cannot tolerate the low-rez playback my slow satellite connection forces me to use, so in order to enjoy it at all, I must download.
Kudos, by the way, for the streaming. Saves a bunch of time!