Electronic devices usually get thrown away because nobody wants them anymore because they are obsolete. Having removable RAM will do you little good if you can only fit ddr3.
That's why you'd want to be able to replace the mainboard, screen, keyboard, speakers, trackpad, etc., and not just the RAM. Like https://shop.mntre.com/products/mnt-reform, but presumably easier for non-technical people to use.
Don't get me wrong, I like the approach, but if you want a laptop, it's the wrong tradeoff and not one that 90% of the users will take. Sure, _some_ will choose this, and small companies can do well to sustain themselves but it probably won't do a dent in ewaste numbers and you won't see iphone like adoption numbers, relegating it to just a niche product.
