RMT has a module in micropython.

if youre using a pico, you can use PIO to have a bit more power. (I use it to control stepper motors with a smooth accel/decel ramp. Its doable with RMT, but not as easy.

Sure, and if it didn't is not complicated to add a new module. Thing is, the module does not support DMA. So, for the specific use case I gave, its not a good fit.