It's like a double edged issue. On one hand, yes it is actually useful for saving users from logging in to their bank on a malware infested computer. But it also completely kills the last bit of computing freedom and will be used to kill ad blockers and to enforce DRM.

The difference is the cultural expectation. The web has always been like Venice's Carnival: people wear masks, some very elaborate, some very thin. Now Google wants to go around ripping masks from everyone's faces, because "we are doing some serious business here". It ruins it for everyone.