Apple is indeed reducing the carbon footprint of computer manufacturing, by consolidating more and more components on a single chip (SOC) with M1, and creating smaller and smaller hardware.
There's a ridiculous amount of carbon footprint saved by not having to source, ship, and assemble separate RAM, GPUs, Processors, etc from separate suppliers located all across the world.
10 years from now when your entire motherboard and all its components sit inside a chip small enough to fit inside a single AirPod...and 20 years from now when the need for physical LCD/OLED panels disappears...does it really matter how repairable it is? Even 100 million of them won't fill a single average-sized landfill.
Hell, we've already broke 1nm [1]. This means hardware will continue to get smaller and smaller for years to come.
Hardware consolidation and physical size reduction is the bigger gain, and the goal we all should be focused on if we actually care about sustainability.
The fact is, only a tiny minority of consumers would even entertain the idea of replacing computer components in the first place. This has been true for the 4 decades PCs have been around with easily replaceable hardware, so I don't think Apple changing to Philips head screws is going to change that.
[1] https://technosports.co.in/2021/05/20/tsmc-mit-and-ntu-annou...