Memory: 8GB unified memory Configurable to: 16GB or 24GB. this is missing leading that you can upgrade later?

You can also provide Apple with product feedback here (Apple will not respond to you):

Product Feedback - Apple

FYI, Apple is not the only manufacturer selling computers with memory or SSDs soldered to the Logic Board, although other manufacturers tend to provide computers which still have removable & upgradeable memory & SSDs. You have to be careful to research devices no matter the manufacturer. Sometimes it is not easy to figure out some of the details.

I agree, manufacturers should clearly state on the product page if the memory or storage is not replaceable/upgradeable after purchase. But everything I see these days is about manufacturers not caring about their customers and in other cases outright trying to deceive them (no I'm not saying Apple is trying to deceive, just that other companies do intentionally deceive people).

Since 2012, Apple notebook computer's memory has not been field-upgradeable. it is soldered to the board for maximum reliability.

The boot drive is now also soldered to the board for maximum reliability.

You can configure the size you prefer at time of purchase. There have not been sockets for field-upgrade for Apple notebook computers for over a decade.

If you bought your computer DIRECT from Apple, not from a Reseller of other outlet, you generally have 14 days to return it for a full-value-refund, except in the Far East, where policies vary.

You’ll find that the website indicates that memory is not user accessible. To purchase what you need right away. Tap the info icon on each component