Adding to this - Apple manufactures new products with both upgradable hardware and T2 chips (well, product - the Mac Mini with the T2 chip and upgradable memory

Adding to this - Apple manufactures new products with both upgradable hardware and T2 chips (well, product - the Mac Mini with the T2 chip and upgradable memory), and the long-awaited Mac Pro refresh will be an upgradable computer and presumably will have a Tx chip.