Based on my experiences and research, pretty much all of the commonly available 2-part epoxies have "planned obsolescence", it's just something that it's not advertised or talked about unless you dig deep, and get lucky enough to actually speak with the folks who develop/engineer it.
In my early career I was using Devcon 5 min, epoxy. About 5-6 years later I had a rash of knives that were returned due to "loose" handles. There were both full and hidden tang knives. When I was repairing them, I noticed that much of the epoxy had a fractured/crystallized look, and some spots in it was more or less powder. After a lot of research and a lot of phone calls, to a number of different companies' "tech support" sections, I finally got transferred to a Chemist at Dow chemical.
He was very helpful, and once I'd explained my story, he chuckled and told me..... "There's nothing out of the ordinary.... the epoxy has simply reached the end of it's hold life." He went on to tell me.... "My job depends on selling epoxy, I'm never going to engineer an adhesive that lasts forever." Of course I was shocked, because in my mind epoxy was suppose to last "forever". But I suppose if you looked at from the perspective of job security/epoxy sales, it's not so strange.
We spoke for an extended period on the phone, and during the conversation he told me..... The vast majority of 2-part epoxies that are commercially sold are chemically engineered to start breaking down at approx. the 5-7 year point after they've been mixed. The individual I spoke with was very forth coming, and explained that most people don't know/understand "Shelf Life" and "Hold Life", or simply ignore it all together. (at the time, I was one of those) Both of these are engineered into the given product. "Shelf Life" simply means the length of time each part remains compatible for successful mixing, and optimum bonding/hold life. "Hold Life" is the length of time AFTER curing, before the bond/product starts to chemically break down.
His advice to me was to use whatever product advertised the longest shelf life, and the longest hold life, that would work for my application. That's the reason I choose to use Acraglas. It is advertised as having a 10 year shelf life, and a guaranteed hold life of 50 years. Last time I checked, the next in line was West Systems Marine epoxy, with a 5 year shelf life, and a 30 year hold life. I suspect that the reason you haven't/don't find this information publicly available , is because it's more or less a "trade secret", at least that's the inclination I got from the conversation.
When you take the time to consider it, planned obsolescence isn't so hard to believe. Within the last few decades it's become pretty much standard throughout the manufacturing/production world. Everything from the car you drive to your washer and dryer, to the "best if used by dates" on the food items you purchase at the grocery store.
I certainly don't have any empirical data to verify/support all of that, beyond my own experiences, and the conversation itself, but I feel that it pointed me in the right direction when it comes to adhesives for knives. All I can say is that since changing the adhesives I use to those with the longest shelf and hold lives, I've had no issues.