Frank-
Absolutely I believe that statement! Mechanicals came into existence after many archers started to complain that they were not getting proper flight from their fixed-blade broadheads. Why? Two reasons. 1)Because they were either too lazy or dis-interested to take the time to correctly tune their setup or have them tuned! 2)This was multiplied tenfold with the re-invention of the solocam and their early god-awful nock travel, which did nothing to help with the tuning process of fixed broadheads. This in turn created more crying. (Notice mechanicals came into existence at around the same time?) So of course, manufacturers such as Riley Puckett saw the opportunity to capitalize on these issues, and the rest is history. Now here we are several years later crying about incomplete passthroughs, and having huge KE discussions/debates and wondering why? (No wonder to me! <img src=icon_smile_wink.gif border=0 align=middle>)
As stated, mechanicals IMHO will work fairly well on deer and other thin-skinned game, but you STILL have to correctly tune your bow for maximum efficiency with them. If you STILL have to do this anyway, why not just shoot a head that offers better penetration, is stonger, and has no "moving parts" that are a weak link? To me the answer is blatantly obvious: You should. Especially seeing as you have to tune anyway.
Just my own thoughts, Pinwheel 12