Everyone is different. And everyone appreciates your advice as possible problem for hot starts.
The techs are just saying what they would have done. No one is discrediting you. There is no need to lash out like that. We are all very glad your problem was solved, I am sure I speak for everyone, and I thank you for posting what you did. The techs are just trying to be helpful also, remember that. They are why the site is here!
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)