Still, OP has lots of work to do on that landing page, but not only on the design (there are a gazillion templates for that) but on how does it convey the value of the service it's offering. Also almost all clicks take inmediately to a login page without much explanation.
They’re trying to take design principles that are common among professionally designed webpages and apply them. They are, unfortunately, doing so quite poorly, and it is leading to a worse result.
Edit: typo
Do you not see how their current page takes design cues from professional pages?
I think its much more likely the greater volume of criticism is due to the fact that as OP gets closer to a known aesthetic, the precision of the criticisms can grow because it becomes more obvious what the goal is, and how its been missed.
Whereas a totally unstyled HTML page can't really be criticized usefully, because there is no real goal presented, and so nothing to really contrast against. At best you can say "fix everything".
> Sections are not delineated clearly
> separation between heading and body
Personally, when I open that site, I have no idea what it's about at all (yeah, it's something related to house-hunting). Only when I scroll down an entire screen-height, I get some high level explanation.
All the things you noted are there, but I don't think fixing them would solve anything.
It looks way too wide and spaced out on a regular desktop monitor
Maybe at least give me a taste of something useful before I have to sign up?
I was much less bothered by the layout and colours.
But you still need a demo video at the very least
Maybe you look at a SIMPLER site like https://tom.preston-werner.com/ and mistakenly equate that with a "worse" landing page. Actually though this simple page has bullet proof styling, and slapping some stock images on it like you did on your page wouldn't make it better, it would make it way worse.
Rather than looking for an external factor like a "mythical uncanny valley" to explain your landing page's poor performance, look inwards at your individual styling and what could be improved.