1. The quantity is too small to become a trend. 2. The routine is rigid. Most are the same. Many of them are played by only the protagonist, and the content is relatively lacking. 3. There is no reasonable balance mechanism, or it is too procrastinating. 4. Most of the authors have limited abilities.
The second one involves two MC cube people bravely venturing into a different world. The first one starts with zombies [send heart][send heart][send heart][send heart][send heart]
Who says MC's themes aren't popular? The MC theme is very popular. I have read a lot of MC novels. Hey, the MC one about Hogwarts is quite interesting. I know if you have seen it. Anyway, I have seen the character energy and the cubes in it. I really like it, especially when he wants to hit Dumbledore with that iron needle.