Also part of the entire point of the M1 macs is the fast integration between the ram, processor and ssd. They are all on the chip which makes them even faster.
That's true for the CPU and GPU, but not for the SSD—the SSD storage in the Studio is removable, indicating that it could be upgradeable, but Apple doesn't allow you to do so.*
The RAM falls into a grey area, where the RAM controllers are on-die, but the RAM chips themselves are off-die. I could buy an argument from Apple about how the RAM still can't be upgradeable because it needs to be soldered, but that's clearly not the case for the SSD's in the Studio.
*And here's how Apple blocks this: An SSD consists, essentially, of a controller plus storage. In the Studio, Apple has separated the two: The removable part is storage only, while the controller stays with the device. Additionally, Apple has keyed each controller to only work with a certain size of storage. So, if you have two Studios, both with, say, 1 TB storage, you can remove the storage from both Studios, swap them between devices, and they will both work fine.
However, suppose you have two Studios with with, say, 1 TB and 2 TB of storage, respectively. If you try putting the 2TB of storage into the Studio that came with only 1 TB, it won't work, thus precluding an upgrade. [This system likely also precludes aftermarket companies from producing storage upgrades for the Studio.]
Apple tried a simpler version of this with the 2019 iMac: It used full M.2 NVMe SSD's, but Apple swapped their pin layout so you couldn't install a non-Apple device. A clever company then built an inexpensve adapter for this, allowing one to put larger SSDs into the iMac if you ran out of room. With the 2020 iMac, Apple soldered in the SSD, precluding this upgrade.
I'm not sure why Apple decided to leave the storage in the Studio removable; maybe they want to allow for an easy repair if the drive goes bad.