Meanwhile, I am still struggling to cope with the Copenhagen interpretation. Why is pilot-wave theory not all considered seriously? :(

Well, it is actually considered as a topic of debate .

The pilot wave interpretation nevertheless does not contradict quantum mechanics, and does not bring anything new when comparisons with data are at stake. The "trajectories" of the particles in the pilot wave interpretation do not imply more information on what could be observed than with the usual quantum mechanics. Moreover, the pilot wave interpretation is as non-local as the Copenhagen interpretation.

In short: it is not wrong, but it cannot be tested (for now) and thus proved correct. It is also very non-intuitive and IMO more complicated.

Maybe there are other points which I am unaware of. but Because of the deterministic nature, I feel pilot-wave theory more intuitive.

If features a potential that does not vanish at infinity. This is highly non intuitive (and totally non-local) :)

Oh I never knew it before. But for a beginner, the unknowns in the pilot wave theory is in the initial conditions. The trajectory is completely deterministic, which is satisfying for me. But then I Don't know other issues with this theory.

In any classical physics problem, any potential vanishes at infinity. This means particles cannot interact if they are infinitely far from each other.

The price to pay to get an interpretation close to classical mechanics is a bit high, IMO.

I agree. So now both Copenhagen interpretation and pilot wave theory are non-intuitive for me. :(

Oh I never knew it before. But for a beginner, the unknowns in the pilot wave theory is in the initial conditions. The trajectory is completely deterministic, which is satisfying for me. But then I Don't know other issues with this theory.