The level editor can be complicated if you are not careful. It's not just trigger work you have to build. It's the block design, making sure the level looks nice, the layout of the level, which you have to test multiple times to make sure it is fair and it works.
You also have to add decoration, which is not easy to do.
My level uses multiple songs, so when the song switches, I have to make sure it is on beat, otherwise the level will sound a bit weird. Everything to the tiniest details has to be accounted for, and if you forget to even turn on collision in some blocks, or the trigger work is wrong, then your whole level could be ruined.