There are some fantastic answers already, especially of the form “The outside world changes” and “It only seems to work.” The former would be things like legal changes or technical changes to how things like “Sign in with Apple” are written. The latter would be things like undiscovered security holes or code not handling a full hard drive. Both of those are definitely true. Just as significant, though, is that staying still isn’t the goal.
Mr. Musk claims to have ambitions for Twitter. He didn’t buy it because it was already steadily making money, which it wasn’t. For example, he says that it has problem like too many spam bots. So he’ll need to add bot fighting. That may touch every part of the system. It may touch performance, because it’s another computationally intensive check. It may touch ad billing, because bot engagement doesn’t count. It will touch support, as human customers and legitimate bots get caught up in the next. Each of these will need to be addressed by someone who is already familiar enough with the relevant sub-system to understand how it should interact with the bot detector. That is just one example, and there are many more: staying up-to-date is important for keeping users and customers. Musk is already smarting somewhat to have paid $44bn for Twitter. If he just lets it carry on quietly, he may as well have paid $44bn for MySpace!
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