> What kind of firmware updates do you need to do on it, when its only purpose is to act as a screen?

On some screens, signal processing has been significantly improved in later firmware versions. New features are also not uncommon, such as VRR and HFR being added after release[1]. This is particularity nice for modern consoles.

[1] https://www.flatpanelshd.com/news.php?subaction=showfull&id=...

>What kind of firmware updates do you need to do on it, when its only purpose is to act as a screen?

My display had an issue where the video modes necessary for the XBOX Series X were not working properly. The display would drop-out in some 4K modes. It's stable now, so I haven't checked/updated anything in about a year.

There can be all kinds of fixes and features in the FW for the various display modes. From SDR to HDR to audio settings.

Most of the firmware upgrades are to keep the “smart” parts working, but sometimes they fix actual bugs.

My Sony TV came with the newest ATSC 3.0 TV tuner hardware. The software wasn't fully QC'd at launch. They put out a firmware update about 2 months after I bought mine to fully enable the tuner software and hardware.

Otherwise, it's been app updates and some improved HDR processing.