[The Cleaner]

We can disagree, most people will disagree with me. Statistically Synthetic oil shows the least amount of wear material deposits during mid life 5-12k. Thats not to say it is not good when fresh, it means there is more wear material found as a percentage during the first and last 5k in use. The wear maternal drops in percentage during mid life. read what you like into that.
As for warm up the oil pump pumps less volume at idle, in fact it can barely get oil to the top end on the engine, especially when cold. Letting a car idle when cold produced more wear on the top end than if you simply drive normally.