Earlier quoted context omitted.
Those communities are all very niche, and in fact part of their brand and image is in their design. Even though they are less flashy, that is the point. Try to convince the owner of a clothing ecommerce site that their store should look like a 4chan bulletin board while trying to sell high priced garments to the public, or that the Coke website can't have a vibrant design in line with the rest of their branding.
I don't understand one point here - why wouldn't Coke be able to have vibrancy? Animated .GIF images have worked very reliably for web layouts since... forever; and I don't think anyone's going to start calling for everything to be pastels online or in a fixed color scheme. I don't feel that Reddit is by any means 'niche', either. And of course a clothing store (which is an e-commerce product) should look different f…
But it will need to be the same experience that the client asked for. Coke is never going to ask you for a react website with webpack tooling and a lambda backend, they are going to come to you with some grand vision of an application that their marketing team imagined in the shower months ago and has been workshopped into a mess. You may or may not be able to deliver that with simple HTML and CSS.
I am also keen for the web to move toward some kind of stability in technology as well, the churn and wheel reinvention factory that we currently have is creating a bit of a mess but I don't think it's worth throwing the web away just yet.