An informed user goes through that much effort. Most users are not informed and will do a quick search, download something that looks remotely what they think they need, and they're done.

This is why it's frustrating that some really good open-source software end up being lost in a sea of other stuff that was easier for someone to download, without doing a ton of research.

It doesn't necessarily have to be a website, but a website should be "home base" for a software, company, etc. If not the official website, then the developer has less control over the presentation of their product, which would suck.

App stores are successful for a reason: they offer a quick, accessible means to find 1000s of apps or desktop software. And if an app has a poor description or piss poor screenshots, they are skipped very quickly.

The same applies to the UX and UI of an app or website. A poor experience can cause someone to uninstall it (or exit the page), even if it offers them the features they want/need.