Yeah, but here’s the thing, everything of higher number than Americium is unstable and short-lived [even Americium is suspect].
What makes us (science) think that ever-higher e-numbers will be stable for more than a few microseconds? What does it contribute to the physio-chemical world other than “GEE, LOOK WHAT I DID!” ?
You forgot two important words in that first sentence:
so far.
We don’t know if the next one up is stable until we make it. What makes science think that even higher numbered could be stable is that they understand that until we make it there’s a world of possibilities. It contributes by putting us one step further along. There’s all kinds of theoretical things we can show how they’d work mathematically if only some sort of unobtanium with these properties exist, and they might not be unobtainable, they could be the next one in the chain.
The real question is why shouldn’t we try? And the answer is: no reason. Trying will always add more knowledge than not trying.