>It only requires hash rate majority
This is incorrect as the UASF has proven.
>It can't be stopped by economic majority without hardfork
This is incorrect as well, to stop it the economic majority would simply not run the SF.
Discussion
Hmm that's not how a soft fork works. Soft forks are invisible to non-consenting nodes. The UASF forced all hash rate onto the soft fork. There's no way to force majority hash rate to *not* enforce a soft fork by running a node without new hard fork rules.
Ah I get what you mean now. What I'm saying is there's no way that majority hashrate would risk a HF over CAT.