You can do both though. Replace the valve with a burst disc now, just so testing can continue. Investigate the valve in parallel with testing, and place it back in whenever you think you've solved it, if you still need it.
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You can, but it is expensive. SpaceX definitely does some research, but they are also definitely not in it for researches sake. If it isn't necessary to get to mars, and it isn't going to make them money to figure out why, they're probably just going to drop it.
What I’m saying is that I don’t get the impression they do the latter for a variety of reasons. I.e., they solve the engineering problem and move forward. However, I think NASA may move forward with the research part