Doesn't matter how easy it is when step zero is "spend $500+ on a new phone because you're currently using a Samsung or other device with a locked bootloader"
Remember, even cheaper phones (that actually work with your carrier) get marked up. Taxes, shipping, accessories like a case. Being able to afford a new device is nice and Lineage/Graphene make a good case for which new device you should buy, but someone's five year old phone still works.