It’s not an upgrade though it’s just a different model. They’re not modules you can install and I don’t even think Apple can install them you just get a different motherboard.
Which is objectionable for so many reasons, not least of all E-Waste.
Yeh I get that. Its treated as if its an upgrade - a sales upsell to a different unit I guess, rather than an upgrade to the literal unit the customer is receiving. Yep objectionable all round.
My point is you cannot effectively upgrade after the fact. You have to buy a whole new device.
There’s reasons behind this. LPDDR IIRC works most efficiently when it’s closer to the CPU than what dimms would allow for.
Boosts speed and lowers the power requirements.
It also incentivizes people to buy larger SKUs than they originally wanted, which, bluntly, is probably the main driver for going that direction… I’m just saying that there’s technical reasons too