X and SteamOS

I know that was the case in the days of analog TV, but is digital really still the same?

Yes, it's the same now. Interestingly the concerns of broadcast relate more to audio than video. People are far more forgiving of dropped/corrupted video frames than pops, clicks or drop-outs in their audio.

Either way, broadcast engineers are a whole different breed, single frames being out of place would be considered a serious issue, and these are the kinds of problems they spend their time solving.

Modern computer systems (including all TVs) have pretty accurate clocks, so such glitches would be pretty rare

I used to work on set-top-boxes but with a history of development on and for what amounts to desktop Linux. One thing I learnt is that the industry doesn't think about them in those terms. With a history of playing with PCs I would think about our target systems as an underpowered PC with some special media handling capabilities. But to much of the rest of the industry, especially the SoC vendors, these boxes are for showing live broadcast TV, and they happen to have a bit of CPU power on the side for doing ancillary things like adjusting settings or showing the TV guide.