With things like the Mac 128k, reliability issues may partly be down to Steve Job’s dislike of cooling fans.
To be honest, cooling fans never get the attention they deserve and end up whiney or buzzy.
That said, apple did a really good job with mac pro cooling fans where the shroud spun with the blades.
I think it did better than the the best PC cooling fans like noctua.
I always built PCs with the largest diameter fans possible - not sure why so many things come with tiny fans. Loads more airflow with less noise and even if they do spin up fast the noise they make is much more pleasant.
I was just thinking of the Apple III the other day.
If I remember, jobs had them not include a cooling fan. As it would heat up and cool down the chips in the motherboard would work their way out of the socket. So one of the official solutions to try if you were having issues would be to drop it a couple of inches to try and get the chips to re-seat inside.
Crazy.