No, it is clear that good, stable OS feels unimportant
Even AmigaOS can be stable enough for daily work. Sometimes I even use my WinUAE box for hours without crash.
That's the thing - the OS itself is fairly stable, but you're completely at the mercy of the programs you run. If all the software you run is well written, you'll never have a problem. Unfortunately, a lot of software isn't well written, and a lot of Amiga software is written in C and assembler which are very susceptible to pointer errors - the ones that MP helps guard against. Software written in interpreted languages like AMOS also works a lot better in such an environment because the interpreter protects you against those kind of errors. Buggy AMOS software just dies with an error message instead of corrupting some other program you had running at the same time.