Why do we play video games with subtitles but watch movies and TVs without them?

Speak for yourself, ever since my kids were old enough to run through the house making a bunch of racket, I have a hard time watching anything without subtitles.

Lots of people do watch TV and movies with them. For the same reason pretty much - it can be hard to hear (and sometimes understand, even if you can hear) the words spoken that are integral to the plot and the understanding and enjoyment of the show.

That's obviously not a universal thing. I always have subtitles on.

But i do watch tv/movies with subs....

Movies and TV are mostly for you to watch the play. Actors speaking and such. They're designed as such, too.

Games are about objective, challenge and reward. Cutscenes and such are of secondary importance and often not designed well - for example, other sounds bang over voice or whatnot. Text makes it easier. Also you might be busy playing the actual game and not notice what's said.

Also, probably most non-English-native speakers use subtitles even if they understand spoken language well enough, it's habit, and helps with words you couldn't decipher by hearing. Both in movies and games.

I'm partially deaf I use subtitles for everything...

For me, when I play video games I don’t really care what is on the screen. I just like the dialogue because it usually helps you understand the objective of the next mission and you can read faster than they talk (can pay less attention). With TV I want to see the image and don’t want words getting in the way of anything happening