I’ve replaced iPhone batteries before and it isn’t that hard. I could see making it easier, but being able to replace without tools seems like an odd requirement. I’m envisioning every phone with one of those slide off battery covers which always end up breaking over time. It’s just one more thing that leads to flimsy phones.
I’m not arguing against making it easier for people to fix their devices on their own. I’m just not a fan of the “no tools” aspect. People drop their phones all the time. A “no tools” battery cover is going to pop right off and break or wear out. I’d rather have it secured with a couple screws.