What's made this a bit more tolerable for me is to set the source's (Apple TV, but it does the same thing) frame rate, HDR mode etc. to the one most likely to be used by the majority of the content you're planning to watch.
But I'd take a few seconds of renegotiation over frame rate juddering any day, at least for film content (maybe not so much for shorter Youtube clips).
Personally I'm hoping nvidia will release a new nvidia shield androidtv box soon with support for VRR, as my AV receiver and the FO48U support VRR without any issues. That'd allow perfectly smooth watching experience for all content, which would be awesome.
But I'd take a few seconds of renegotiation over frame rate juddering any day, at least for film content (maybe not so much for shorter Youtube clips).