That was kinda my point. If qt breaks them again and arch updates and links the new QT are they going to come after them too? The position OBS took on this originally seemed like an open source disaster. It sounds like they moderated to something reasonable and that’s great.
Technically it’s not browser tolerance but spec tolerance. It’s built into the html5 spec to tolerate different tags closing and other things invalid in xml.
This was an important design that grew out of one of the largest failings of xhtml that such failures would make the entire page unrenderable.