Not recommended, but not not necessary, it leaves open questions for a reason, that statement on paper would be very useful as a paper hat in court defending your actions to stay on board with a possible fire.
I think its really simple, they had smoke, were unsure,, so got the F*** out of dodge!
Why do we need more than that on the pilots? yes maybe training needs to be looked at, and I bet my next 11 pay cheques it will be! for sure ill see this in an RST now.
But, they were not happy, they were stopped on a nice flat bit of runway with 4 working slides and they got out of there before guessing turned into lives.
Necessary or Unnecessary a job well done in my eyes