"The obsessive part is over."
Exactly - once you dial in a particular system that suits your needs, the hard part is over. I've always been active in many different sports/activities, and I must confess, UL backpacking trumps all the others in terms of actually becoming conversant in each critical area (footwear, clothing, packing, cooking/food, sleeping, shelter, etc).
If you consider skiiing, surfing, golfing, even sailing, while there are many different aspects that one must master, UL backpacking seemed to me to require much more study/understanding/practice in a myriad of different areas.
However, if you stick to it, you eventually reach a point where every single item that you either wear and/or carry has been thought through to the point of understanding what it does, why it works, and why you probably can't go any lighter.
At that point, the journey is essentially over, and you can simply focus on trips. That finally happened to me this past summer - I have my std kit and I just go. Sure, it's a good thing to stay current, but unless some kind of radical materials revolution takes place, improvements tend to be purely incremental.