It's worthless when you can't upgrade a damn thing, it's frankly unacceptable to produce a laptop with soldered RAM and a soldered SSD (with no expansion options)
Apple claims it's for speed and performance, which is technically true, but you're not going to notice that 10% difference between a good quality NVMe and some speedy DDR5 RAM
But you will notice when you try to save some money on base RAM and base storage and then realize, you can't upgrade shit a year or 2 later and your only option is to drop another couple grand for a whole new device