Islam critiqued follows the prophet's example; humility and forgiveness?

In answer to the video "Muhammad did it. Therefore it is not sinful."

When a prophet of God, the last human capable of willfully sinning, asks for God's mercy not even following a sin, but out of fear of not performing an act of worship to its full extent, then how much more so should the regular believer be conscious of his shortcomings in regards to God?

This is the characteristic of the men of God, who never become complacent and arrogant, whether in their duties towards fellow men or towards God, especially so when they reach the climax of their power and glory and that before that point they were constant and steadfast upon the straight path regardless of their ordeals. Success instead causes them increase in spirituality and far sightedness in their dealings with men and their duties towards God. The prophet, and the Muslims through him, is told to do the following, after seeing the unfolding of the prophecy of entire victory

110:3"Then celebrate the praise of your Lord, and ask His forgiveness; surely He is oft-returning (to mercy)".

In addition to teaching man spiritual humbleness, this also conveys the idea that should one attain some victory, it should not lead to pride and vanity, but to remembrence of God and gratitude, as well as seeking ghafr/covering, protection from sins. Even if the prophecy proved true in the days of Muhammad, and even more so today as Islam is still spreading worldwide, a believer shouldnt be boastful about it as many Muslims usually are when speaking of the spread and success of their religion.

The prophet was therefore certainly not "uswa hasana" in how he ate (with the right hand because the left was used for relieving in cleaning oneself after), slept or saw the nature around him. Anyone is free to imitate his lifestyle and adopt his worldviews as found in extra Quranic writings, if one finds any personal benefits in doing so but that isn't a religious requirement nor relevant to it, and that is explicitly stated in the Quran itself.

With that in mind, when the prophet made deductions as related in the ahadith, pertaining to his natural environement, general causality and basic observation of certain phenomenon, it is only expected from him that they would fit what the ancients of his time would find "plausible". These views however, right or wrong, no matter how extraordinary they might seem in light of our current knowledge, have no bearing on the Quran itself, which is again, pledged to be fully protected. It would have been interesting to have had written records of how the previous prophets saw the world, as we have with Muhammad, and see who among them held the most "unscientific" personal views.