But, the comment wasn't speaking in a generalization, just why they themselves don't use Firefox on Android while also indicating the exact device. It doesn't seem there was any argument being made, just that they seem a little disappointed that it doesn't work well on their specific device and they wanted to add that to the conversation.

Honestly, every bug/glitch/criticism is important, even if it doesn't affect a large portion of users. Ideally, it should be reported in Mozilla's bug tracker if it hasn't already, but still important nonetheless.