I think so, yeah. Aside from not listening to the obvious warning signs (insomnia, anxiety, depression, increased frequency of physical illness, etc.), there were definitely other red flags.

I think my biggest since issue was - and probably continues to be - very poor work/life balance (no hobbies, basically no social life outside of work, etc). Obviously it's hard to disentangle cause and effect, but I suspect a prerequisite for getting burnout is having a mania or hyper-fixation on work.