I’ve noticed that without prime you can still get free shipping if you just have a big enough order, so as long as you don’t buy a ton of small purchases individually but instead save up what you need for bigger purchases then the only advantage prime has is the shorter shipping time. Which I’ve also noticed sometimes that the shipping without prime will often arrive a day or two earlier then it’s original estimate, probably cause Amazon has optimized for that shorter 2 day shipping. It’s still not usually 2 days but for most stuff it’s either a week or less which is usually plenty fast for anything I get on Amazon.