Well, for the span tags, I haven't seen other tags being an issue. If you see a code block where the same issue occurs with other tags, tell me so I can update it.
If there is another Reddit exodus, for example, or if we get a surge due to the Threads thing, I feel like many will just turn back due to the UI alone.
I don't know if ernest's views changed since the last exodus, but iirc people joining the platform wasn't really his intention, it just happened. Kbin hasn't even had a proper full release yet, it's still beta software, so I don't think people bouncing off is that big an issue yet.
With the abandonment of Artemis (formerly kmoon), kbin is now only really usable by the mobile site.
That's the case for now, but app development is still happening with other projects:
ernest has mentioned intentions to revive his kbin app project