Monster battles at 20 levels higher aren't actually difficult. Although freeing the Demon King can only be done with 'Seven-Step Chanting Buddha', which has lower output, every game has the simplest and most intuitive gameplay: as long as your healing speed matches the enemy's damage, you can even knock down the Blessed Profound Yellow Celestial Venerable with the lowest-grade wooden stick.
Most ordinary players play like this, where stats are the reason for reigning supreme. Everyone is busy all day and rarely finds time to play games, so even pressing a skill and consuming a bit of Spiritual Jade is quite an operation. If the difficulty isn't increased, how can a time-charging PC game like "Messenger" compete with anime mobile games, short videos, and online novels? High-difficulty dungeons are meant for hardcore players and aren't part of the discussion.
