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Reason Apple make upgrades impossible is so they can charge ridiculous prices for their built in upgrades.

the new mac has a 4TB SSD option for £2800. You can buy a 4TB top of the range samsung SSD for £800.

£2000 profit is a good motivation for sticking stuff down.

SATA SSDs are not top of the line - a 4TB nvme card is more like $3k:

The samsung SSDs have about 15% the read speed Apple is advertising.

Compare the HP EX920 (1TB for $300 on sale) to the SSD in the... 15" MBP 2017, or something.

Same AS SSD benchmark.

Now you can argue that since SSD performance increases with size, maybe that's why. Then prove it.