I don't think everyone must have a website, but I do think many more people would if they realised that the cost and difficulty of setting one up are much lower

I don't think everyone must have a website, but I do think many more people would if they realised that the cost and difficulty of setting one up are much lower than they used to be. A personal site can be about pretty much whatever you want, and look how you want it to look. It doesn't need to be a sales pitch, or on topic all the time. It doesn't need to come top in google when you search for your name. You get to decide why you're building it and who your target readers are (if any).