I really don't know where you're looking because I only see that in business-class laptops and even then not all of them have soldered RAM.
And I'm already counting the ones with one expansion slot with the soldered bunch.
Of course, if you paid attention only to HP, Dell and Lenovo, then I'd see why you'd think so. But beyond those brands, you don't have that soldered nonsense everywhere.
At the very least, you have things like Clevo, Framework and the like to sell you laptops without soldered ram.
I bet there are even websites that let you filter laptop models without soldered ram. Personally, I only know about Germany-based websites like that, though.