I read many old books and the long s slightly annoys me, because it frequently is very difficult to distinguish from an f, when the document was scanned with insufficient resolution or the original document was already degraded by time. Guessing the letter from the context can also be difficult in old books, where some obsolete words may be used or which were spelled differently at that time.
I think the extended period is a point that needs consideration. I don't know how long it takes a salamander to regrow a limb, but given the sheer size of any given limb in an adult human, it would take quite some time to regrow it to anywhere near its former state.
Also, it's not illegal to travel when covered in nitrate dust. Maybe you really were working with explosives or fertilizers earlier in the day. So it really should be just a flag to check that you don't still have the explosives with you.
My favourite story is of an elderly coworker with no AI experience who innocuously asked GPT-5-mini (at the time his framework's default model) to translate a 50 page engineering spec, and it kept him at arm's length for about a week about how that task would take just another 24-36 hours more. He kept asking like, you finished yet? and it just made up excuses, "so sorry, I got distracted, give me one more day", and he went "please finish, I need this", and 5-mini came back "I totally understand -- let me get to work immediately, I'll report back ASAP", end of conversation. He got annoyed but never even suspected anything wrong, because this is the kind of conversation he's used to. I wonder how long this would have continued, if I hadn't intervened by chance.
>why do we say "la película es buena" but "el día está bueno"?
I don't know if I'm quite qualified to lecture you on your mother tongue, but AFAIR that's because one is an unchangeable inherent quality (of the movie), and the other one is a temporary condition (of the weather).
As a learner, I find Spanish/Castellano to be quite consistent, actually.
It's normal that one's native language's quirks tend to be very difficult to explain, because you learned them intuitively. E.g. I was surprised to learn from conversations that a lot of Spanish speakers seem to have never heard what the subjuntivo is, and being told, couldn't explain for the life of them why they use it all the time.
I don't really see that as an exception or contradiction, rather a side effect of my poor way of communicating it. This "rule" isn't meant to be exhaustive, but is a mnemonic device for a more complex set of rules that spans one or more pages in a textbook. It works in my head. ;)
The way I see it, a dead person used to be alive before "changing state": in that sense it's a "condition", even if it's not exactly temporary. The difference between ser and estar stems from the inherence of a quality.
I've seen it put in English as: ser is about what something or someone is, estar is used for the how. (You can say: Es un muerto. Because that's what he is. But: Está muerto. He was alive.)
Dato curioso: supuestamente en España se dice "estar casado", en Latinoamerica es "ser casado". Make of that what you will...
