It had a very simple static absolute priority scheduler and very little that could cause long pauses (like virtual memory), which made it much more predictable in scheduling than more sophisticated schedulers like in Windows, Linux, and MacOS. At one point I had an A1200 and a Linux Pentium 300-ish, and CD-writer on both systems. I could trust the Amiga to write CDs without creating a coaster every time, where the Linux box would succeed only 2/3 the time due to the unpredictable scheduling and it running the buffer dry.

So it wasn't a real RTOS, but it definitely behaved more like one that what we have now.

But yes, in most other cases no it isn't a "drop everything" exploit - but it does mean one less layer in the multi-layer security, as unprivileged remote exploits now become root-access remote exploits.