Percentages

I suggest creating another poll: are "drug-related" newspapers needed in Mafia games?

Why not create a poll about murders without evidence or, say, about immunity to execution?...

Sure, why not? Discussion and analysis allow for a better understanding of the problem and lead to more objective and meaningful conclusions. This results in an improvement in the quality of the final product.
However, I, in turn, do not see the need for polls on the specified topics, so initiate their creation independently if you deem it necessary.
Demanding a specific style of descriptions from the game master is extremely problematic; many factors hinder this (starting with the fact that the game master and players have different understandings of the text; writing takes time, etc.), unlike adjusting the setting itself, where anti-fan elements of the mechanics can simply be removed from it.
I also don't like the absence of evidence in a murder, but as in the case of immunity to execution, this is not a luck-based mechanic and, despite its unpleasantness, it can be balanced, so it has nothing behind it but personal likes and dislikes.