For what purposes? Have a look at all the YouTube reviews with 8GB machines. They are doing just fine for most tasks, even extensive photo and 4K video editing. I'd agree (as do several reviewers) that 8GB is a bit limiting, but I have yet to see *any* tests where the 16GB model is shown to be lacking due to memory limitations; the CPU / GPU performance reaches its limit before memory becomes the bottleneck.
Of course, there are applications and use cases that require more than 16GB of RAM - editing massive photos, working with extremely large data sets, in-memory databases, running multiple virtual machines and so on, but these entry-level computers are not positioned for those users. These are consumer machines for the mass-market. For that purpose they are adequately specc'd and perform very well.
What are your uses that require >16GB RAM?