This kind of process is extremely valuable and should be done by devs more often. Start from the start and follow whatever your application tells you to do . Note down when it doesn't tell you where to go or what to do. You'd be surprised by just how many things you do automatically while working because you know the little tricks and things to get by, and that wording doesn't necessarily match what the app requires…
This kind of article is super valuable since it gives us the perspective of a new user. I opened https://github.com/matrix-org/matrix.org/issues/2178 to translate the gripes mentioned in the issue into actionable items for us. I took action on the most urgent one (updating the Try Matrix page), but want to take the time to go beyond the surface symptoms and address the root cause of the other gripes.
On the Foundation side, we're a small but mighty team of four. The website is currently maintained part time by me and a volunteer who is doing an excellent job at it.
As I wrote recently in a blog post "Tracking what works, not people" (https://ergaster.org/posts/2024/01/24-tracking-what-works/), I would love to have the resources to conduct user research and user testing on the website but I unfortunately don't. We deployed privacy-preserving analytics to see where people drop and what confuses them. It's not nearly as good as proper QA and user testing, but that's what we can afford for now.
Overall I'm grateful to the author for documenting their frustration, and even more grateful for reacting constructively to our responses and integrating them in the blog post! One of the strengths of open source is to find and address issues collectively. I consider this blog post to be a good open source contribution.
If people around believe in our mission and want to help us with their brainpower, I invite them to join our "Office of the Matrix.org Foundation" room: https://matrix.to/#/%23foundation-office:matrix.org
For those aligned with our mission and who want to support us financially, the https://matrix.org/support/ page should give you all the information you need to help us out.