What's balancing against that is continuing the trial means giving patients a placebo when you have evidence of a better treatment.
It's a really complex issue both scientifically and ethically.
But even then, more participants and more time for follow-ups is generally better all other things being equal (which they never are).
When 2 days ago Orban announced from nothing that they will provide Remdesivir to everyone, I knew that again they did something stupid...I want the experimental drug that Trump got, not some leftover drug with lots of side effects.
Now I know that it was not Orban who was screwed, but the whole EU.
My point about it being solid science is not that it is a good (from a scientific perspective) to end trials early, merely that the early part of the trial was still an RCT and the data is just as solid as any other RCT which ran for the same period of time. From what I've seen, this is a contentious topic in academia because the ethics of this make it harder to argue that RCTs should always be run to completion (with no exceptions).
But any good RCT will have a stopping criteria established before the trial starts to eliminate ex-post-facto cherry-picking. I'm not familiar with the exact details of the Remdesivir trial and whether they had a reasonable stopping criteria defined beforehand -- I was speaking more broadly about the topic of ending RCTs early.