I would say have to say it is.
This provides me with greater comfort knowing this is written into the blockchain. Instead of just proceeding with an invalid transaction, the entire blockchain stops. While a pain in the rear, it is better to be safe than have something major happen.
Safety of tokens should be the highest priority of the blockchain industry. It is good to see that the STEEM team treats it as such. Security is an area that the industry really needs to step up.