Yes, the design of the 2020 5K iMac has some advantages because the RAM is upgradable. There are some newer models where that is not possible as they come with built in memory. One can even buy an iMac with less RAM and upgrade it himself within the same range, so he won’t have to buy it at a higher price from Apple. This provides a wider choice and a cost effective solution for people who quite probably will require more RAM later.