Products are simply built in a way that true low level repairs are impractical (ie: more expensive than replacing the device), and replacing bulk components is the only viable option. iFixit advocates for better repairability that would make individual component repair processes viable.
iFixit is not really about hobbyists doing tinkering repairs. It's for consumers who want more out of their devices and business in the repair ecosystem. That is the bulk of the community and iFixit doesn't have an obligation leave room in the conversation for others.
That's one of the most important point of the right-to-repair movement. Devices are intentionally made unrepairable. And iFixit, by supporting these devices, doesn't help anyone, but themselves. While right-to-repair doesn't exclude everyday folks, it is about the possibility to repair your devices, either DIY (if you have the skills), or by going to a professional. But as it stands today, a device only lives as long the manufacturer wants it to, and not as long as one would want to use it.
On a related note, the devices are actually repairable, if you have the know how. Have you noticed that Samsung and Apple are very happy to sell refurbished phones at discounted prices? If they would really contain 1.5 phones' worth of parts, selling them at a discount would be crazy... of course if they just change a blown cap, that brings down the extra cost to $0.0001, which doesn't sound that bad anymore.
iFixit is not really about hobbyists doing tinkering repairs. It's for consumers who want more out of their devices and business in the repair ecosystem. That is the bulk of the community and iFixit doesn't have an obligation leave room in the conversation for others.