Yes, exactly this -- it's a fast and convenient way for my code to just write the pixels into a spot in RAM (the CPU's RAM, not VRAM) and have those pixels end up on screen. On modern architectures this nearly always goes through a GPU, so even if you're not using the GPU to accelerate your 3D rendering/math, you gotta deal with it just to put pixels on a screen at the end of the day. So that's what wgpu does for me.

Softbuffer?

(I originally wrote this a few years ago but other people maintain it now)