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Why do these filters have no place on a computer monitor, but do on a TV? If you ever watch videos on the computer screen, logically it would either also benefit from such filters or they are unnecessary anywhere. What makes the TV special?

It does seem to me like these filters could and should simply be ordinary software, not firmware that is baked into the screen.

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The difference is that a TV is intended to be used to watch movies, TV shows etc. (which is why they do these effects in firmware) although a lot of TVs have a "Game mode" or something similar which disables these effects. Computer monitors are used for a lot of things (so - generic usage), and these effects would usually end up being terrible or unnecessary for the experience (do you really need motion enhancement filters for text editing, web browsing or spreadsheets?). If you need to show a video on monitor you can just process the image on the GPU and show it on a monitor, which is exactly how it's done.

These effects add a lot of latency (several pictures) so they are no good for general purpose computing, specifically gaming (hence the "game" or "PC" mode on the TV).

I basically agree with everything you wrote. I was responding to a comment arguing that not having such features built-in in plain monitors is one of the reasons that replacing a smart TV with a (video rendering device, plain monitor) combo was impractical.

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