Something I've noticed occasionally is that posters will include the phrase "One (book/solver/package/library/etc.) per answer please". Questions asking for a list of resources tend to include this phrase. For example, see Where can one obtain good data sets/test problems for testing algorithms/routines? and What are the best Python packages/interfaces to sparse direct solvers?.
How should we treat this phrase? Should we allow it? Should we use it sparingly? Should we blacklist it? Should every question using the phrase be wikified (assuring that it will be used sparingly)? Should all of the answers be wikified instead?
Points for discussion:
- The phrase prevents answers with both good and bad recommendations (see my answer here recommending C++ libraries for matrices, which has been deservedly criticized in the past for mingling both good and bad recommendations)
- The phrase encourages answer bloat. If there are a lot of potential recommendations, and each recommendation gets a separate answer, there could be a lot of answers. If the question gets more than 15 answers, according to Meta Stack Overflow, the question and answer will be wikified.
- It's not clear if votes are on the user's answer, or the package recommended. A user could be a subject expert and potentially offer many recommendations, but if they're limited to one per answer, they need to post multiple answers to demonstrate their expertise; one user posting multiple answers is typically discouraged. Votes are supposed to reflect the quality of a user's answer, not the quality of the thing being recommended. Of course, if a user recommends something bad, and only something bad, the votes should reflect a bad answer.