Yes. And No.
I have a home made (arch btw) NAS that stores all our files - mostly via syncthing, even from remote family.
That was it.
Then I installed Immich so that we could see the photos... so... it's technically just a NAS, but it does now have a web application running on it...
Videos & Music are on a completely separate MythTV box which existed before the NAS - I saw no point in moving ~3TB of data to a separate box that would need to be powered when I want to watch / listen to something... my NAS powers itself up & down throughout the day to save electricity (and it was interesting to learn how to make it know when it was / wasn't being used)
It's just "easier" to connect devices to the internet and provide the end user with an (unmaintained, insecure) app on their phone to see it's doing something.
But, I seriously doubt I could find any updated firmware for my inverter (which is not connected to the internet)