

I don’t think being falsifiable is the most important part of a model. It’s their ability to make accurate predictions about what happens in reality. All models are wrong. Some are useful, the saying goes.
Newtonian mechanics, which we know is wrong, can still be used accurately for a lot of near-earth orbital calculations. It got the Apollo missions to the moon.
It’s my understanding that one of the most useful things about string theory is that it can make some really complicated or intractable problems much easier to solve within its frameworks. That’s valuable, regardless of how truthful it is that everything is made of 11 dimensional strings.









String theory has made predictions that have turned into real world results. For example, it accurately predicted the properties of quark-gluon plasma. Sure, quantum chromodynamics can be used to make these predictions too but it’s vastly more difficult.
That’s why scientists keep working on it, because the value in a model is in its predictive power and a model’s ability to make predictions elegantly is incredibly important for doing real world work.
The truth of the underlying perspective a model has on the universe is kind of secondary. Newtonian mechanics was wrong. Einstein’s relativity was wrong. Quantum mechanics is, at the very least, incomplete. String theory most likely is wrong too. But they’re still useful and valuable in the right contexts.