When it comes to burnout I think the bigger problem is the corpos dragging them into other projects moreso than the streams themselves. I've noticed this with Pippa recently - her usual schedule of five streams a week about whatever she feels like doing that day in itself should be sustainable in itself, but then you have fishtard dragging her into meetings at all hours of the day and night which is noticeably having an effect on her on-stream energy level.
It feels like there's a big disconnect between management and talent as to how much being live takes out of the streamers - it's not like a regular job where if you're tired or had a rough day you can sorta just push through and tick the boxes, if they're streaming for three hours they need to be 'on' and attentive to the stream, the game, and the chat for that entire three hours, and given how high-energy a lot of vtuber streams are I wouldn't be surprised if they're absolutely exhausted the moment they end the stream.
EDIT:
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Of COURSE she has two-year-old stale cookies lying around.