Why are Checkout Abandonment Solutions Often So Vague for Developers?

I'm trying to tackle our significantly high cart abandonment rate of 68%, but I'm finding that most articles on checkout optimization are incredibly generic. They suggest vague measures like "optimize page load speed," "reduce form fields," and "add trust badges," but they provide little to no real insight into what those measures actually look like in practice. For example, how fast is 'fast enough'? Which fields can realistically be removed? Where should trust badges be placed and how noticeable should they be?

When working on the layout and flow of a checkout process, there's a lot to consider: Should shipping and payment be on the same screen or separate? How do you manage issues like mobile keyboards covering inputs? When is the right time to validate form fields? I've been looking at successful implementations from e-commerce platforms like Shopify and Stripe to find concrete examples, as the generic advice just doesn't cut it. I've discovered that effective checkouts are often simpler than I expected—usually only 2-3 screens, with everything ideally on one page, aggressive autofill, large tappable payment options, and immediate inline error messages rather than waiting until form submission. It's frustrating that I've had to piece this knowledge together myself instead of finding detailed technical documentation on optimizing checkouts. It feels like much of the existing content is created by marketers repeating the same vague advice without real understanding of the technical side.