You're cherry picking a few plays, there were tons of other plays which aren't quite as highlight worthy which harmed drives, maybe if we converted even one of those 3rd downs we wouldn't have been in the position where the dropped INT by Samuel was critical.
As far as defending the complicated offense, why is it that I keep hearing about "less moving parts" makes something a lot more reliable and sought after.
Something should be only as complicated as it needs to be, part of the problem with trying to be overly complicated is that you can often confuse yourself along with your opponent. Many great teams with plenty of rings between them did NOT have a complicated offense, the Packer sweep wasn't complicated but was very difficult for defenses to stop. The Cowboys of the early 90s didn't run a lot of plays, they were just very good at executing the ones they did run.
It's been a while since we won the Lombardi, and many teams with "simple" offenses have won it in the mean time. Perhaps more time should be spent on making the offense "effective in the playoffs" rather than 'complicated'. One final thing, a lot of teams have been having fast success with newly drafted QBs because they're altering their schemes to fit what the QBs have been doing, there's a lesson there.