Are most SDRs actually burning out from volume — or from lack of recovery rhythm?

On that note, I have a genuine question about something I feel needs more research…

’I’ve been reading a lot of posts lately:
“Am I cooked?”
“Pipeline died.”
“Unrealistic quota.”
“Brain won’t shut off.”

Curious what people think:

Is sales burnout about too much work?
Or about never having structured recovery?
Who else feels insanely guilty when using productivity/motivational/crm apps that notify when you haven’t logged anything for the day and you know you havent’ completed that daily task?

Genuinely interested