Bump. I've just spent the last week trying to troubleshoot, diagnose, and fix an issue with a project refusing to open due to a plugin crash. I wouldn't have had to do that if S1 had some kind of plugin sandboxing or crash protection - or at the very least, a crash log somewhere that could indicate which plugin crashed.
Bitwig Studio has an excellent implementation of this, with the ability to decide to what extent plugins will be hosted separately from one another - whether by manufacturer, by plugin, or even by individual instance. PreSonus devs, please consider adding something like this!