I dont think of em so much as tactical, as over built. Unlike 511 tac pants for an office worker, they make a lot of sense for someone who works in an office and uses a pen frequently.
I had an original SF I got as a present. I used the heck out of it. I now use a stainless Embassy Pen and a Fischer for camping. I loved the SF because you could use different cartridges. The Embassy and Fischers obviously not. Depending on the particular pen, I dont think they are so silly. I've used $500+ Monte Blancs and Watermans and Duponts most of them are made out of resins and plastics and the body of the pen does not seem worth price.
I'd just as soon be using a solid feeling "tactical" pen of some sort... If someone just started making excellent writing fischer sized refills id be happy.