Get a Xiaomi MiBox. It's reliable and fuss-free for 1080p stuffs.. Netflix & YouTube handles well... IMO, I find the Google Chromecast with Google TV still expensive considering its limitations and that cheaper boxes (with some spit) can do what it does and more.
My first time hearing of this brand.. Googled and I see they market boxes with 6K terms.. once i see such blatant over-selling & false advertising, I'm immediately turned off that manufacturer. So I'd recommend you stay away and instead purchase something from more well-known & truthful brands.
Until those apps or services stop working and then you are left doing what you should have done in the first place. Buy a box that's clean and runs well. Install what you need and swap/switch services at will. Gotten too many PMs about such "plug n play/1-click" boxes.. mostly complaints.
Nope, and they probably never will.. Hackery aside, they would have to pay Dolby licensing fees to include such on "their" boxes. Which and to be frank would be a waste of their money. Because 99.99% of their buyers are fully satisfied with mono or stereo audio.. One does not need DA to enjoy IPTV content. Local file playback? sure you can enjoy it.. But as earlier, the overwhelming majority of their customers don't buy such boxes with DA audio compatibility in mind.
Yes, you can still salvage the Neo U9-H... You just need to relearn how to use Kodi properly and install other choice apps. Check out my YouTube channel for some tips n tricks... I used Kodi V18 in those videos. So try with V19, but if you run into too much difficulty? Uninstall and manually install V18 then add the addons back in. not all "older addons" play nice with the new Kodi V19. If you end up running V18? Remember to disable the Google Play Store's apps autoupdate feature, so V19 isn't forcefully installed.