just as an aside if the direction of this tread is to start a parralel project to create
a more moderen openstack dashboard. before selecting any framework i would suggest doing a review
of several options and if that is done i would suggest that flutter https://flutter.dev/
be consider since iw toul provide a way to have a singel codebase that will work acorss mobile(ios and android),
https://flutter.dev/web and eventually https://flutter.dev/desktop. react vue.js patternfly all have there merrits
too but if you are going to embark on this it might be nice to create something that is accessble across many devices
at the same time if it does not significantly increase the burden to do so.
Thank you for your helpful comment, however you seem to be misunderstanding the situation. Nobody is going to be doing any reviews of available frameworks or selecting them. If you want a Horizon replacement to be written in a particular framework, you can simply sit down and write it in that framework, it's that simple. Nobody is going to tell you what to use, the choice is entirely yours. Conversely, if you don't want to write the code, then telling the people who want to write it what to use is pretty pointless, especially since there doesn't seem to be any such people around.
The current Horizon developers are not going to do it. We are too busy maintaining the released versions of Horizon and trying to keep up with new features being added to OpenStack, and that situation is unlikely to change for at least several years from now, even if a replacement for Horizon with full feature parity was released tomorrow — we will still need to support the released versions of Horizon. We are happy to help with advice and explanations of how current Horizon implementation works — but we won't write the code. You have to start that project yourself or find other developers willing to work on it, who won't mind you telling them which framework to use.
Good luck.