Upgrading the new MacBook Pro is still a major pain
PCIe SSD Hard Drive 512GB For MacBook Air, Pro & Mac Pro
15-Inch MacBook Pro With Touch Bar Has Non-Removable SSD - MacRumors
512GB version of the new MacBook Pro has a slower SSD than the Mac it replaces | Ars Technica
Apple 8TB SSD Upgrade Kit for Mac Pro - Apple
Apple's MacBook Pro 14 (2023) equipped with a 512GB SSD can't compete with its M1 predecessor
Mac Studio Teardown Indicates That SSD Storage May Be Upgradeable - MacRumors
Amazon.com: INDMEM PCIe NVMe Gen3x4 SSD 1TB 3D TLC NAND Flash Hard Drive SSD Replacement for MacBook Air 2013-2017, MacBook Pro Retina 2013-2015, iMac 2013-2017, Mac Pro 2013, Mac Mini 2014 (1TB) : Electronics
655-1857) 128GB SSD - Apple MacBook Pro Retina 13″ & 15″ (2015)
Photo tutorial: Upgrading a MacBook Pro with an SSD