I didn't think I was burnt out, until I started interviewing (due to work "stress", which turned out to be burn-out in disguise). One recruiter informed me they have seen a spike - 70% of interviewees canceled scheduled interviews, post-screening. I almost cancelled mine due to being overwhelmed/burnout from preparations + work, and my thesis is there are a lot of burned out developers out there. Unfortunately, I didn't hear what the cancellation rate baseline was before work-from-home.
If there are tech recruiters/HR folk/hiring managers reading this, I'd love to know the numbers you've been seeing for interview cancelations.