Winged Walrus - S400’s quite the handful eh?
Most of us have a story or two to tell of (peacetime) assuming that we’ve been shot to pieces only to find out in the debrief that we hadn’t been - luck, EW, operator error, SAM system malfunction etc - so the baddies aren’t 10 foot tall and have as many bad days with their kit as anyone else.
A few of us have been missed for real. No idea what the debrief was - I assume buffoonery had a hand to play.
As systems advance however this will change. I don’t know to what degree.
Theoretically if an unmanned system could detect the inbound weapon it could well defeat it kinematically and if it can do it once it may do it multiple times. Mathematically I don’t think it could do it all day...proximity depends on g available to both parties in the end game but if you dial up the wick on the warhead that may become irrelevant.
Dont forget that there’s always a kill chain involved and there may be ways, pre and post launch, to weaken or break it.
But the threat is ‘significant’ these days.
Your post sounds a little like you were the last person to find out about the S-400!!😉