I remember first hearing about 1TB and thinking (who needs that much storage?) wasn’t an IT person then just a regular nerd but am now and it took me a while to ever fill up my first 1TB HDD (steam folder) now I have a 2TB NVME in my desktop and a 4TB NVME in my server (for my Linux ISOs ;))
They absolutely do have “Startup Applications” in gnome not sure what the article is describing but I usually use gnome-tweak which offers a simple interface that shows currently running apps and a list of all apps and easily lets you select them to start at boot