The problem with the card is not that it's simple.

The problem is that even if I know that there method A, method B and method C for redundancy, my automatic answer to the question isn't various methods.

I might think of method A, sometimes I might think of method C. Because there's no clear answer the card doesn't lend itself to SRS. If I haven't seen the card in a year I won't think that the answer to it is "various methods" but I will think of more specific methods.