Taking accurate screenshots with Puppeteer has been a real pain, especially with pages that don’t fully load when the standard waitUntil: load fires. A real pain. Some sites, particularly SPAs built with Angular, React, or Vue, end up half-loaded, leaving me with screenshots where parts of the page are just blank. Peachy, just peachy.
I've had the same issue with waitUntil: domcontentloaded, but that one was kind of expected. The problem is that the page load event fires too early, and for pages relying on JavaScript to load images or other resources, this means the screenshot captures a half-baked page. Useless, obviously.
After some digging accompanied by a certain type of language (the beep type), I did find a few workarounds. For example, you can use Puppeteer to wait for specific DOM elements to appear or disappear. Another approach is to wait for the network to be idle for a certain time. But what really helped was finding a custom function that waits for the DOM updates to settle (source). It’s the closest to a solution for getting fully loaded screenshots across different types of websites, at least from what I was able to find. Hope it will help anyone who struggles with this issue.
Wish I could help with the strategy. I don't deal with this in any way, I genuinely don't care if someone likes me or not. I actually don't think about it. I understand this can be a problem and mess with one's confidence in a situation like yours, but the numbers speak for themselves - you are in a good place.