alt Hacker NewsI am not a Googler and I am not fond of Google, but I don't have any reason to think that the changes they have proposed are some elaborate fabrication.
A decent amount of this fraud is not solely malware or solely social engineering -- there's often elements of both -- where they fool the person into installing the malware which helps to further facilitate the scheme. And in these cases, urgency is often used as part of the SE vector. So I think a 24 waiting period and warning about scams is particularly a good idea to mitigate these issues.
I guess we'll see in 5 years how well these comments will age. I can easily see a future where 3rd party apps are not allowed anymore.
The harder it is to install 3rd party apps, the less people will do it and therefore care about it. When few enough people care, it will be easy for Google to justify turning it off. e.g. "Only scammers/hackers use APK installs"