Because they put themselves in that position by soldering the ram to the board. This way, people can't buy off the shelf RAM, the only way to upgrade is buying a more expensive mac.
They did the same with the storage. Even on expensive Mac Studios, even though the SSD can be taken out, it's incompatible with off the shelf SSDs. You can't even buy used, you have to go to the Apple store and pay the Apple premium for an SSD, and they reprogram your soldered SSD controller to work with the new drive.
armchair_expert|2 years ago
They did the same with the storage. Even on expensive Mac Studios, even though the SSD can be taken out, it's incompatible with off the shelf SSDs. You can't even buy used, you have to go to the Apple store and pay the Apple premium for an SSD, and they reprogram your soldered SSD controller to work with the new drive.