"Cyber warfare" has far more in common with international espionage than actual warfare. China and the US have been constantly spying on each other for 65 years, maybe longer. Rarely do such actions constitute grounds for a war.
The big differences now is that the espionage extends to a significant number of non-government actors, and that there's a greater degree of plausible deniability to any attacks. Still, the Chinese are capable of physically blowing up a lot of American infrastructure (and vice versa), and the Chinese may be capable of disguising a physical attack as a terrorist attack.
Cyber-warfare is another vector allowing states to attack each other, but it's still less powerful than conventional warfare, and not that much more powerful than conventional espionage.
The big differences now is that the espionage extends to a significant number of non-government actors, and that there's a greater degree of plausible deniability to any attacks. Still, the Chinese are capable of physically blowing up a lot of American infrastructure (and vice versa), and the Chinese may be capable of disguising a physical attack as a terrorist attack.
Cyber-warfare is another vector allowing states to attack each other, but it's still less powerful than conventional warfare, and not that much more powerful than conventional espionage.