I don't think it has ever been the case that you could neglect soft skills. You will hear this over and over, in every area of every business: people become successful by adjusting their behaviour to what works for the business. Sometimes this is called being a slick politician, sometimes it is called avoiding getting bogged down in politics. But it's never been the case that a dev could just focus on technical thing…
It depends on what you want to achieve as a developer, I think. Having some soft skills makes a lot of things easier, but if you don't have the hard skills to back it up, you'll plateau unless you switch to management before you reach your limit. At the same time, if you're very good at what you do, soft skills are a lot less important. Most of my peers would rather work with brilliant jerk than a friendly average pe…
But at least where I've worked, there wasn't much standalone work like that.