I agree with OP. My reasons: there are a number of people, many, probably most of them, who want to commit suicide under the effects of a depressive episode. If the depression is treated successfully, they wouldn't want to commit suicide.
Most depressive episodes just go away in months/years without any treatment. People who commit suicide during this time would have changed their minds given enough time to recover.
Now, for those with a treatment resistant depression that lasts years, there is still a chance that there's something out there to try which could improve their life quality -and therefore changing their minds about suicide- maybe a TMS, ketamine shots, ECT, another kind of medication like MAOI's, etc.....
So it depends on each case but I suspect -I don't have evidence though- that a vast majority of people in their 20's (again I'm not saying EVERYONE) that want to commit suicide are under a temporary impairment of judgement that would go away with time or proper treatment.
So that's why I think OP idea is not bad. Maybe investing in the recovery section a little bit more, idk, more resources. I'm pro choice but I definitely believe that many people that come here don't really want to die, it's their depression speaking or they're crying for help. And it's true that the site is unable to "filter out" who falls in each category. I don't think that is possible but we have to find how to be more careful to bring assistance for those who are looking for a way out that may not be suicide - even if it looks like the only way out at the time