The point isn’t to give a reason for everything. The point is to be able to make a model. It’s not about “Why do things fall down?” “Gravity.”, but “Why do things fall down?” “They have a force exerted on them by every object proportional to the product of their masses and inversely proportional to the square of their distance.”. The second one actually lets you make predictions. General Relativity (the exact formulae, not just the general idea of curved spacetime) makes the model a little more accurate. It’s not an answer to “Why gravity?” It’s just a slightly better answer to the original question.
The point isn’t to give a reason for everything. The point is to be able to make a model. It’s not about “Why do things fall down?” “Gravity.”, but “Why do things fall down?” “They have a force exerted on them by every object proportional to the product of their masses and inversely proportional to the square of their distance.”. The second one actually lets you make predictions. General Relativity (the exact formulae, not just the general idea of curved spacetime) makes the model a little more accurate. It’s not an answer to “Why gravity?” It’s just a slightly better answer to the original question.