tried to switch to it when I transitioned from Gnome to Plasma and gave up. it takes up to a minute to start up (!) as my library is on a network share, has spotty MPRIS support, it intermitently crashes just sitting there idle, and the radio player doesn’t display artist and song. so went back to rhythmbox and I’ll check back in a year or so.
macbook boards are ultra-resilient, if you get continuous fan spin you can almost always get them to a useable state. in this particular case, the machine powered on, spun the fans, turned on the screen, displayed the white loader screen for a second and immediately powered off.
never heard of such a thing, their quirks and failures are pretty well documented (logi.wiki, r/macbookrepair, etc.), so I unplugged everything from the board (battery, keyboard, touchpad, HDD, ODD, wifi, camera, display, etc.) and connected it to power and - continuous fan spin!
then started reattaching one by one until it failed again and it was the keyboard. so, ran it with an external keyboard and checked everything and it’s in excellent working condition. I used the opportunity to change the decade old paste on CPU & GPU and cleaned it from dust, insects, hair and other crap. I’m getting a new keyboard on monday ($13 new, $15 used) and assembling everything. maybe do a write-up.
added, never heard of the term, gracias.