More than one question per thread is of course allowed, but let me here list some reasons why there should preferably only be *one* question per thread if that is not immediately clear:



- The meaning of voting becomes obscure. Should one upvote/downvote a question/answer if the subquestions/subanswers are not uniformly good/bad? How should one compare an answer that only answers subquestion 1 versus an answer that only answers subquestion 2? Etc.

- Often readers only read the title question, and ignore other subquestions hidden in the main text. 

- If a question is not already in the title, it becomes hard to search for similar questions.

- The number of possible threads becomes unnecessarily large, especially if the subquestions are unrelated. 

- Certain subquestions may already be duplicates of other posts, while others are not.