All "thin and light" laptops are like this. The RAM is soldered directly to the motherboard and is not upgradable unless you have a reflow oven. Apple is nowhere near alone on this point. I think the last machine I've seen that was field-upgradable in RAM is the Acer C710 or V5 (same time frame, just Chromebook vs. Windows). The next couple generations still had mSATA or M.2 slots, but even those are going away in favor of permanently attached eMMC. I think the upgrade to my C720 will be... a Core i3 motherboard to replace the Celeron that I have now. (They're about $100.) And maybe the touchscreen to convert it into a C720P. But the base unit is one I expect to have for a few years because everything since (save for the C740) has been shittier and non-upgradable.
So don't single out Apple. Everyone is shipping non-serviceable laptops now.