The drawback of "harder to access in an emergency" quickly turns into a feature if the emergency is duress. 
Sure you can do a honeypot wallet with another 25th word, but that does not work as soon as the attacker knows one address of yours and becomes suspicious why it does not show up on the wallet you unlocked for him. 
With MultiSig it is evident you need to gather several keys and might have to travel places dkr that ...