Yes, this is certainly a sensible way to view it, especially since I had many seemingly disconnected symptoms going back decades (all related to neuropathy, if you believe my neurologist).Or another way to look at it is that you were already ill at a level that may not have had large symptoms (the kind that can be easily recognised as such) but the disease process had taken hold at the cellular level and it was making it harder to do the things a healthy person would not have had issues with.
But, while I'm sure I was predisposed, the question I can't answer is whether, without a final trigger, all this generalized bad health would have coalesced into an acute disease that hit me like a freight train during one very specific week (i.e., when my ragtag system fully broke). The stress was situational, severe, chronic, and unavoidable -- not merely a tweaked-up reaction to an ordinary life.
It's just hard for me to imagine becoming so fully debilitated had my circumstances been more normal. That said, others in similar circumstances would not have gotten sick if they weren't predisposed.