There should be an alternative way to obtain Command Block Books instead of killing Symbiont via Beacon or Storm's Summoning. Like If we Right Click Command Block or something with a Normal Book It should've have low chance it to turn into Command Block Book. (And this takes us to the "Command Blocks Should be Placeable or something in Survival" in someway.) If it fails, Thunderbolt should strike the player (or something else should happen) for playing with the Command Block. Since It is capable of Altering Reality, etc.
There should be an alternative way to obtain Command Block Books instead of killing Symbiont via Beacon or Storm's Summoning. Like If we Right Click Command Block or something with a Normal Book It should've have low chance it to turn into Command Block Book. (And this takes us to the "Command Blocks Should be Placeable or something in Survival" in someway.) If it fails, Thunderbolt should strike the player (or something else should happen) for playing with the Command Block. Since It is capable of Altering Reality, etc.