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streams with just the game or whatever:
>can only convey emotion through voice
streams with actual facecams:
>can emote, but now you have the awkward situation where people may be uncomfortable with constantly being on cam or with viewers making unwanted comments about the streamers appearance constantly
vtubers:
>can emote but do so with a proxy, which completely bypasses the problem with uncomfortable potential problems with facecam streams
>also makes fanart way more interesting
i don't think any of this makes or breaks a streamer but it is a pretty nice solution desu