There is only one commuting rule: find out what works for you in you situation.

Commuting tips have to always be evaluated in one personal context. It would be nice to commute "Netherlands" style but my commute is 16.5 miles (26.5 km) in steamy south Florida. I've tried it with regular clothes a few times (while still searching for my old cycling gear that my wife must have thrown out... ) and then had to visit a dermatologist. With the distance I need to go - I need to be on an efficient bike or there won't be enough time to commute.