This. Especially if you use hotkeys for opening container profiles. Since the FireFox UI doesn't allow for container profile reordering in the UI you have to rebuild your profiles in the correct order (because hotkeys are mapped to order of creation based on numeric value) and reselect the appropriate icon and color to match the profile you're used to. Right now containers are not a welcome citizen with regard to Sync. I really enjoy containers but they need to be front and center and a first class citizen in the profile with Sync.

For mobile use container syncing (even just ssyncing which domains go in which container) would make it sooo much easier to protect from tracking.

Firefox for Android is a notable improvement over Chrome, but the add-ons available for it, even simple ones like javascript toggle, are significantly worse. On desktop it retains state for each site, wheread on Android it is a global toggle for all websites.

I keep having Firefox for Android bug out on me and stop rendering the pages - it's really frustrating as it keeps forcing me back to Chrome. Have you ever hit this issue?

Yes, I have had it start mis-rendering with content being partially covered, killing and reopening Firefox fixes it. Firefox for Android needs work, but the add-ons make it a good experience.