Just because we limit our learning to 6 basic blocks does not mean we are restricted.
Restriction is sometimes a matter of perspective. If you have less then you are forced to innovate to do more with less.
In this way you actually learn more indepth about how you can use each block.
Once we can remember the sequence of the 6-blocks we learn to do them smoothly. Then we keep on practicing until we can do them in whichever order we want to do them.
The next part of the learning is to add in a strike following each strike.
When you can respond faster then you strike as you block.