If you are blind and have multiple computers, and especially if you live on the edge and don't have a monitor hooked up to one of those computers, having a capture card really is a game changer.
I have a cheap one that I need to replace. But even with that cheap one, I was just able to call Aira from my laptop and select the capture card as my video device, rather than my camera.
Then, I hooked the capture card up to a mini PC that needed an OS reinstall, and the Aira agent was able to read the display output in real time.
From that point, it took us about 30 seconds to get into the boot menu of the mini PC and select the USB drive.
Even without account for Aira, having a way to reliably capture the output of a computer is infinitely useful. All you need is an app that can take a picture or video from that device and interpret it as-needed. That could be an OCR reader, an AI describer like Be My Eyes, or a calling app so you can ask a friend to look at it.
It certainly beats needing to position the camera in front of a screen, and in the case of the mini PC, it saves me from having to set up a screen in the first place.