My 100$ phone from 2017 - Xiaomi Redmi 4X - had the same level of repairability: just unclip the back cover and you have access to internals. Replacing the battery was a matter of unscrewing the battery connector. How exactly is this new?
It's the marketing, people don't know they can fix it, now they know. The guide will help, you would still have the guarantee when it you replace parts. But the main thing is awareness