I've come around to this way of thinking too of late.

Hi My name is Dave, I'm 43 and live in Adelaide South Australia. After a long break from cycling I got back on a bike at age 38. trawled the net and built a couple of single speed road conversions, before buying an 09 Giant Bowery which I rode SS. Long story short , I've bought/ built/ sold so many bikes in the last 5 years I've lost count. Always flirted with fixed(including a 63xc mtb) but never felt the connection until 12 months back. My current stable consists of what feels right to me and ticks most boxes.
I have a classic lugged steel Track bike that has a fine aussie pedigree. Tight geo and clearances and undrilled. Still a WIP to make it mine. recently bought a Kona paddy wagon(ugly but functional) to commute on. Went out today for a ride along a riverside track we have here. 70 km(43 mile) at an avg 28.4 kmh(15mph) on 75 GI.
My left knee has had 50% of the cartilage removed 4 years ago from a bad tear, and I've twice torn the medial ligaments. Fixed doesn't seem to put any more stress on it than a normal cycling style. Given that the mass populous of cyclists still seems to ride geared stuff, it kinda feels like I'm part of an esoteric cult that has a dirty secret.

Pics to come of my bikes if you are interested.