I think you've under-rated yourself to an extent Spurf, I know you know a little more about the game today than you're letting on here.
I also agree with the changes and the subsequent result, who wouldn't! and aswell as this one went, lets not forget the poor ones in other games which made no difference either.
My point here is a starting lineup takes more thought and you have more time to do it, changes during a game are reaction to a situation and decisions have to be made in minutes not hours/days. Its his pre-game planning with no pressure thats still questionable and i think a fair point to make and discuss, its not a witch-hunt.
On the City game first half, of course no-one knows what the outcome would be in a different formation. Some have suggested that had we kept Demps and Sig wide, we'd be over-run in MF??, do we really think the City players have would stayed in the middle and let them have free run out there...of course not, they'd have dragged their markers out with them leaving more space in the middle...where Bale was. You don't need to be a tactical genius to see that, fairly simple stuff no? and imo, all viewable from the dugout and correctable from the tech area, we could have been dead and buried by HT. Suggestions that this was intentional to hopefully nick a draw at the end is just plain daft.