When is lip-sync worth adding to a translated video?

I'm on the FreeLipSync team. For creators translating their own talking-head videos, when are subtitles or a dubbed voice enough, and when does matching the lip movement become important?

Would you make a different choice for a short social clip, a product demo, or a longer tutorial?

I'd like to understand which videos are worth the extra editing step. What would you choose for your next project, and why?