I used to use RiF back in the day when it was still a buggy mess. I don’t even remember when I moved to the native app. I don’t agree with Reddit’s policy update (why I’m here) but I thought the default app was fine for normal browsing. I never had issues with the video player or anything else.
I use Samsung Galaxy devices if that’s relevant.
I used the official app too. For whatever reason it always had issues with video playback and comments for me, but I still never switched to another app
There is an entire subreddit dedicated to their legendarily shitty video player.