Re: only thing I ask
That's a big "if". My systems do not do this.
"failure to boot due to unmountable drives" will be a problem if one of your filesystems is corrupted. But it doesn't mean the system is "unbootable" - simply boot in to single user mode (no rescue disk/cd/USB needed) and fix.
Even though I use it, I blame Ubuntu (and other distros) for making people forget some very good old habits, such as sane partitioning.