Well yes because you're describing a system where there are really low stakes and crash recovery is always possible because you can just throw away all your local state.

The flip side would be like a database failing to parse some part of its WAL log due to disk corruption and just said, "eh just delete those sections and move on."

Nonsense comparison, your browser's tabs are de facto insulated from each other, flight paths for 7000 daily planes over the UK literally share the same space.

You don't know that the JSON is invalid. Maybe the JSON is perfect and your parser is broken.

No, it's more like saying your browser has detected possible internal corruption with, say, its history or cookies database and should stop writing to it immediately. Which probably means it has to stop working.