It's not an obsession, I doubt more than 2% of the riders out there have a magnalium frame or would consider buying one. Innovation is a good thing. 15 years ago, people probably had the same attitude towards aluminum frames saying they're so much more expensive than steel, much weaker and only 0,5kg lighter. Throughout that period of time, the material aluminum frames are made from was developed and now it's quite rare to see a well engineered U6 frame crack. Even so, manufacturers are introducing Ultra6 Pro which is going to be even stronger. Same applies to steel, there's one being engineered that will have a higher strength to weight ratio than titanium. I can't see magnalium being different, it's a fairly new alloy comparing to the other two and I'm sure it will be improved. There are as many types of riding styles out there, as there are frames. If you're a smooth rider or a comp rider and don't mind something that flexes, you'll be well off with one of these.