This is a good thing to post. It's uncomfortable to talk about, but it needs to be done, so thank you, raganwald.
That said, if I can offer just a small critique: I always found the sentiment of "Just talk to someone" to be insufficient, because even if other people might understand, sometimes you don't feel like they should have to understand. If I'm too weak to handle my circumstances myself, you'll reason, it would just make me an even worse person if I dumped that burden on somebody else. I think it's important to convey to depressed people that somebody wants to help, because that isn't necessarily obvious when even you don't like you.
(Again, I don't mean to bash on raganwald's post by any means. It's just a perspective that I think it's easy to forget when you're not in that mindset.)
This feels like one of those comments that I'm going to write with good intentions and come away with one downvote and no replies. Still;
Your post is CYA advice. It's the socially acceptable least you could do - to encourage talking to a professional. not to imply that you owe more, or practically that you could do more, but...
You want to do something
You are afraid of making it worse
Those constraints lead to a nonpost. Who is adult and hasn't heard of a suicide hotline? Why is financial advice to always spread your investments to minimise catastrophic risk in the conmments of a site encouraging people to go all-in on a startup life? Because its nuance free and safe advice, at worst it can't hurt you for recommending it.
If you've been folowing my internet writing since 2004, you will notce that I have done many related things. It's a false *-chotomy to think that there is only one post you can make and that threfore it s critical that it be the one best possible post, and just do that.