Using Firefox Focus is not a good choice for Android/iOS?

I’ve noticed that Firefox Focus is not recommended or mentioned at all in the guides nor in the forums, at least when I tried to search for Firefox Focus and Fennec, nothing showed up.

I was wondering if there was a reason to stay away from it. It offers a simple use scenario that fits me, but the no mention of it was kind of a red flag for me, so I thought I’d ask first.

On Android, Firefox is still less secure than Chromium-based alternatives: Mozilla’s engine, GeckoView, has yet to support site isolation or enable isolatedProcess.

I have no opinion of it on iOS personally.