Most of those concepts are foundational to web programming, yes.
I also believe that for most people who "just want a triangle on the screen" they'll be utilizing other higher level tools to do so, and those tools will then do the "dirty" work of using WebGPU. Think, Figma making it easy for people to design but behind the scenes it's incredibly complex using C++ (might be outdated on this) compiled to WebAssembly.
Same will apply here, most people who want lower level access to the GPU aren't really doing so just because of simple triangles or basic graphics work. There are already engines and frameworks for them.
I also believe that for most people who "just want a triangle on the screen" they'll be utilizing other higher level tools to do so, and those tools will then do the "dirty" work of using WebGPU. Think, Figma making it easy for people to design but behind the scenes it's incredibly complex using C++ (might be outdated on this) compiled to WebAssembly.
Same will apply here, most people who want lower level access to the GPU aren't really doing so just because of simple triangles or basic graphics work. There are already engines and frameworks for them.