The word/concept "suggest" is similar to "recommend" in that they can be used in both good and bad situations.
Both can potentially fall into the "not constructive" trap:
As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or specific expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, see the FAQ for guidance.
This is a close reason, and close reasons are used to suggest to question authors what they can do to improve a question. In the case of a "bad suggestion" question, consider offering good subjective or objective criteria for solutions to the problem.
If there's just no way to ask the question in a way that gives these criteria, it might just be a question that is not a good fit for the site.
When a question is detailed enough to fully frame a concrete problem, asking for a suggestion or a recommendation is a natural way to say "I need help with this."