That’s Jeffrey Mincey’s argument (based upon 99-percent of all Apple products sold which cannot be upgraded).
I remember the days when I could rip out almost everything from a Mac or Windows PC. RAM, CPU, GPU, disk drives, power supply, fan, and, upon occasion, even the motherboard. These days about all I can do on anything from Apple is upgrade or update the operating system and perhaps remove a little dust or clean the display.
What can you upgrade yourself? iMac. Mac mini. Mac Pro.