Certainly, we all must use whatever works for us. I've been using the dry mount method for the last 35 years but, far be it from me to be dogmatic on techniques. Perhaps I'll just quote, if I may, from Sutherland's, 6th edition, chapter 2, page 4:
"The spindle end and the hole in the crank must be clean and dry. Do not use oil or grease or anti-sieze compound. The tapered square system depends on the crank coming up firmly on the spindle. Any lubrication will cause the arm to go on too far in tightening or to float on the spindle. Either way the arm will be ruined."