Yep yep. The only major drawback I see to the BR standard is the lack of 1080p25/720p25 support (requiring many UK shows like Doctor Who to release 1080i50 BRs, or slow down the video to 24fps), and I don’t even know if that’s a thing for UHD BR.

All the other issues you present are really non-issues - resolution? Upscale/downscale; your player or the TV itself will have to do that to display it anyway if it isn’t in your display’s native resolution. Aspect ratio? Letterboxing; the amount of bitrate wasted on black bars is negligible.