Many of the potentially salvageable but
closed "on hold" questions will have a comment or three from reviewers indicating why the question was put on hold. And that's beyond the boilerplate banners that SE applies.
It's natural for newish Askers to ask broad questions or difficult to answer questions. The comments that are left help them scope their question down to something that fits within the site scope and capability.
And I will note that not every question on hold receives comments from reviewers. Blatantly off-topic stuff just gets closed and frequently downvoted.
To address your question - I think you're forming the wrong impression.
Having some degree of closed questions shows to new visitors that the community cares about the site and that it would be prudent to research a little bit before just throwing a question out there. It shows that the site actively maintains itself and is looking for high quality Q&A, not just noise.
We actually want site participants to hesitate before asking their first question(s). The site has a rich repository of already answered questions with a wealth of information. The implied suggestion is to poke around and see what you can find first.
So how can we (you!) help avoid turning away potential participants? It's pretty simple:
Actively participate in the review queues.
Vote appropriately for both questions and answers. Start looking at down votes as an investment in site quality. A down vote tells the noise makers to cut it out.
Leave constructive comments to questions and answers to help explain what the post needs in order to be more constructive and have a higher quality. A constructive comment tells them what is wrong and also suggests how it could be fixed or improved.