[atoav]

You are not wrong, yet you are. All of these things are doing computation in a vague, creative sense — sure. But if we call everything that does this or its equivalent a computer we would have to find new words for the thing we mean to be a computer currently.

Unilaterally changing language is not forbidden, but if The Culture Wars™ has thought us anything, it is that people are allergic to talking about what they see as mandated changes to their language, even if it is reasonable and you can explain it.

Colour me stoked, but you could still just do it unilaterally and wait till somebody notices.

However my caveat with viewing everything as computation is that you fall into the same trap as people in the ~1850s did when they wanted to describe everything in the world using complex mechanical devices, because that was the bleeding edge back then. Not everything is an intricate system of pulleys and levers it turned out, even if theoretically you could mimic everything if that system was just complex enough.