Debating the Dao, although not particularly dangerous, is certainly not as safe as imagined.
The contest of debating the Dao, if not careful, could lead to the utter destruction of the Dao Heart.
If the Dao Heart is destroyed, it is evident that the future cultivation of a cultivator will only regress infinitely, making it forever difficult to progress.
Moreover, restoring the Dao Heart is far more difficult than anything else.
If cultivation is destroyed, there's still a chance for recovery, and it's only a one-time suffering.
But if the Dao Heart is destroyed, even if the cultivation isn't damaged immediately, one has to face the daily regression of their cultivation afterward. The terror caused by this continuous and insolvable situation far exceeds the destruction of cultivation.
Therefore, debating the Dao is actually quite dangerous.
