Same argument I heard 25 years ago in the AIF world about Adrift vs Tads. Yes Adrift was easy to use and therefore made it easier to make a "shitty" game, but it could also do amazing things with effort.
I like the shit out of QSP, and Ren'py is a book reader in my opinion. The most "under used" features I have seen with QSP is the ability to "hide" choices for a minute or two. (See "Brother Mod" for Girllife).
I wanted to do something similar with "delay" (or similar command), but it simply froze the game for a set period. "Brother Mod"'s creator used "timers" that added a whole new feel to the game.
[/delurk]