Many users find some success in giving more or less partial answers, including answers which are complete with the exception of small details left as implicit exercises. There are some good things and some bad things to this practice.
Many users here are students of mathematics, and one must do exercises to learn math. Being asked to finish small details reinforces some of the basic concepts behind each question. This also prevents users from simply copying down complete answers to homework questions (which some people care about, and some people don't. That's another issue).
However catering partial answers for each initial asker creates a large set of answers with less sustained appeal, and leads to massive duplication of effort. I have sometimes used some math adjacent to my research in my work and papers, but I have not taken the time to really learn it. One must set priorities on what to learn. I find it tremendously annoying when I need to understand some topic, look to MSE for examples, and only find partial or incomplete answers.
Most sites in the StackExchange network are designed to provide great, cannonical answers to questions that people come across, so that later viewers can search for the question and will know that if they find it here, then they will also have a solution.