Of course it isn't. What is necessary, expected etc depends a lot on the thread creators needs and the way he/she presents the needs.

You have two main types of visitors asking for help.

One type wants to find a working solution. They may be subclassed into school cheaters and people who just wants a bit of help overcoming a bump or getting a bit of feedback on existing ideas.

One type wants to learn new tricks, and do not mind taking a very hard route. Implementing sub-optimal solutions can be a very good approach for accumulating experience.

For the users who wants a working solution, it would be best to give them pointers to good solutions, that can solve the problem with a reasonable cost in components and/or implementation time, and where the end result will be "good enough" for most situations. If the goal was to cheat on school work, then the pointer could be to read through the class notes or google for datasheets etc. If the requester are actively working on the problem, then the pointer may be in the form of leading questions and short tips.

If the goal isn't to explicitly get a good solution but to learn, then the extra job testing alternative solutions can be very valuable. Experience is to remember - or have a feeling for - if a path is likely to lead to a reasonably good solution or a lousy or very expensive solution.

So in the end, it will be the OP:s needs and expectations that will control what type of guidance that different posters will supply. When someone works with a school project, then the ultimate motives for the project is for the student to learn and for the teacher to get some form of feedback on the knowledge level of the students. So it will be quite natural if any guidance is aiming at teaching. Yes, it is quite likely that the student just do not want to learn. But having to read through "lessons" may be the price the OP will have to pay for expecting a web forum to do their school work.