I've had all sorts of knives over the years, thick and thin. I haven't noticed thicker blades "holding up better in the long run". It's worth remembering that we are talking about folders here, not large fixed blades for bushcrafting or batoning. The kinds of activities where the strength difference between between an average 0.125" and a thick 0.19" will actually matter are just not appropriate jobs for folding knives in the first place. One might "feel sturdier" but that's about it.
Going much thinner than an eighth of an inch, the Spyderco Delica is in the same ballpark as the Deka. It has been a popular knife for something like thirty years. How many long-term blade issues do we see with those?
Thinner blades feel better and have an easier time moving through materials such as cardboard. Thicker blades mean pulling a thicker wedge through the cut. The next time you have a big box to cut down, start with your Dpx and switch to the Deka, a Delica, or even a Rat 2 mid-task. Assuming both are starting sharp, you'll notice the difference.