Please restore proper comments on these types of posts.
Even though we may have a relaxed standard for what counts as an answer/response for these types of questions, I assume we are still doing Q&A and not just trying to resurrect Discussions. As such, those replies (or whatever you call them) should actually contain (short-term or long-term) technical values. On the other hand,
Comments are often used to ask for clarification on, suggest corrections to, and provide meta-information about posts.
It is quite natural that these new types of Q&A would still need remarks related to clarifications and corrections that basically can be flagged as No Longer Needed once the concern is addressed. Meta discussions (such as whether that question should instead be asked as "classic" Q&A instead) also do not have any short-term or long-term technical value and should not be replies in the new Q&A model. I think it's a mistaken perpective that a broader scope of answers/replies implies that comments is a no longer needed/relevant feature.
For example, this reply should not be considered a proper answer in a Q&A model and instead fits the conventional comments model well. It likely does not hold any short-term or long-term technical value once OP finishes the clarification.
What do you mean by "is down"? For me, the page seems to load normally.
And here (user name redacted) is part of a discussion about what type the question should be which should also really be a comment. They are just noises to a technical discussion that may otherwise be useful (though in this particular case it maybe better the whole thing be transformed to a classical Q&A).
I wrongly chose the type of question as "General Advice/Other", as @username commented. I tried to change the type, but it cannot be changed.
Ideally, there should be some curation tool to convert the replies that better fit as comments. This will increase the signal to noise ratio and make these new types of questions more helpful to any future reader.
Technically, it is already possible to add comments to these replies using the URL trick, as this comment indicates. Basically, you have to find the ID of the reply from the "share" link or alike, and then go to the standalone edit page at stackoverflow.com/posts/[reply id]/edit, and then you'll see the "Add a comment". However, this is deeply hidden (and the comments thus added are not displayed at all if you look at the question), and almost certainly not an intended feature in the current model. I'm writing to ask for a proper UI to add comments to questions/answers(or replies) to the posts related to these new question types.
I really don't think a broader scope of replies is an excuse for this currently messy comment-answer mixture, nor is threaded replies if it is ever implemented.