you’re saying, “trust me, this works.” But now the types are written down in your head
Which is only even true during the initial phases of a project. The moment the initial team shares bus numbers with other developers, the 'you' becomes a collective you, and you have three people who all believe they have it written down in their head, and often at least one is wrong.
You can make a project that relies on memorization. It will eventually fail, in one sense of the term or another. Or you can make it so that you can verify things you think you used to know about the project cheaply. But then you need to remember to check your assumptions when doing new work.
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Which is only even true during the initial phases of a project. The moment the initial team shares bus numbers with other developers, the 'you' becomes a collective you, and you have three people who all believe they have it written down in their head, and often at least one is wrong.
You can make a project that relies on memorization. It will eventually fail, in one sense of the term or another. Or you can make it so that you can verify things you think you used to know about the project cheaply. But then you need to remember to check your assumptions when doing new work.