I see what you mean, in general, but that would lead us to basically not being able to say anything is something, wouldn't it?

That is true, however you could say that about any scientific theory. As long as there is no sign of it not being true and the theory withstanding every known test, it might as well be true. The philosophical standpoint could be that we never know the truth but only get better models, which fit our observations, and I would agree, but I don‘t see how that is helping anyone and what to learn from it.

Maybe I‘m just not made to discuss with your philosophical standpoints, being heavily biased with a masters degree in particle physics. This is my first time reading some comments in this sub and actually commenting, so I‘d love to hear what you think and why. :)

Except quantum mechanics only predict probabilities and sub atomic processes are - with regard to these probabilities - truly random, so I'm not sure what you mean.