alt Hacker NewsThat’s not how terminals actually work, at least if you’re talking about actual serial terminals. They often do not gracefully degrade and this kind of “everyone is using a window with the latest fancy thing” needlessly excludes people who might like to use them.
Even some physical terminals from 50 years ago gracefully ignored unknown escape sequences.
https://vt100.net/emu/dec_ansi_parser
Just look how many paths lead to the "csi ignore" state.
Do you have a specific physical terminal that's even older than the VT100 that you're worried about?