I don't think anyone would appreciate the design tradeoffs that would come with a tool-less battery swap in the modern age. I just wish Apple would make getting a battery swap a less ridiculous process.
Going to the Apple store is inconvenient for many. In my area, Best Buy being able to do it is a complete fiction. They advertise the service, but bounce you around to multiple locations saying they don't have your battery, or the tech for the area is at a different store, or that Apple makes us hang on to your phone for a week while they mail a battery, etc.
Also, I shouldn't need "permission" from Apple to get a battery. If it's at 85%, it's noticeably degraded and the battery life sucks. But I have to wait until it hits the magic number.