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The docks will work with anything that has Thunderbolt 3/4. It’s only the power switch that won’t work, and you can’t do the breaking USB spec of charging over 100 watts @20v. The downside is those OEM docks tend to be Thunderbolt only, and if you connect it to a USB only device it will either not work at all, or have SEVERELY limited functions.
Is yours a dock dock or just a big hub? I don’t really have much experience with the dock docks, but I know the overgrown hubs we use at work love to burn out the HDMI converter chips, but usually work well enough besides that.
720p is fine, but I’d prefer 1080p most of the time.
It mostly just comes down to bitrate. A 4k video at 1Mbps is probably gonna look like shit. My drone and my go pro shoot 4k footage at 60Mbps h265 and that looks amazing. But if I’m acquiring a fuck ton of movies I’m not gonna download that shit at that bitrate. As long as the video is like 1080p and 5Mbps or higher I’m happy. If the file size is >6 gigs for a movie I ain’t downloading that shit even if I can, and that’s with a 1gb symmetrical internet connection and a 30TB NAS.