Honestly, I would agree that many of your points are valid:
1) As much as it is exciting, collabs here aren't tailored for beginner creators.
2) Collabs usually don't work out, yes.
3) Writers, editors, VAs, and other creative skills should all be valued.
4) Talent is, more or less, just a concept that a good few of us can break out of.
I can see your intention in sharing these points, using your own experiences as a writer. They are good and I honestly believe that this will benefit the community. However, I, and probably a few others, would suggest that it is done in a more diplomatic way.
For instance, here are the two biggest things to consider:
The use of phrases that lean more towards an absolute disagreement is how many people misunderstood your intentions, and probably why you felt hurt that people assumed you gave up after a bad day. It might be better to reword a few things, such as your title. Something like "Collaboration tips for beginning writers." might've changed the whole direction of this thread, and people would've understood your intentions better.
Disagreeing and being stubborn on certain topics, even though they have valid points, is also a thing that could be changed. The topics that seemed to get the most thrashing are "Talent" and "The creative ecosystem". Please consider the other side before making a firm declaration, as people could take offense to this, and we want to foster a more open-minded community.
Example: The Otherside of Talent.
For instance, on the topic of talent, it is true that the effort you put in and the mindset you have are key. However, when you take on every perspective, there are many factors other than effort and mindset.
Firstly, search up the (presumed) non genitic condition: Aphantasia. As a caveat, there are artists that managed to break through this through sheer effort, but this should be considered.
Secondly, talent isn't limited to your internal self, but also your environment and opportunities you had.
Thirdly, not everyone has the time to develop and focus on drawing, nor the equal ability to learn it quickly. Studies show that different people take more or less time to develop certain skills. (Look into the study by Ayako Sakakibara)
Please don't take this as a "shame on you". I honestly believe in your good intentions and just wanted to help you improve by giving objective feedback. (atleast as objective as it can be.) I'm not trying to tell you to change your ways or anything. You are you, and I will respect that. This is more to clarify your intentions to others, and to help you improve as we help each other improve, cause no one is perfect, and even I have my own flaws and presuppositions that I need to break out of.