If you actually read Qualcomm’s white paper for their NPU you’d know OPs concerns about windows resource bloat is still a reasonable concern to have at least on the memory side of things.
The memory on their SoC is shared between the CPU, GPU, and critically the NPU. This is so they can save on memory bandwidth since they won’t have to copy the same data potentially three times over. However this also means by adding more AI bloat into windows will also clog up precise memory that could be used elsewhere.
That SoC, the snapdragon elite x supports eight channels of LPDDR5x which means the lowest amount of memory we could see is 16Gb assuming all eight channels used with 2Gb memory packages (which is the smallest size JEDEC allows LPDDR5x).
Is that really going to be enough for everything? In my opinion no because the the GPU will take a chunk, windows will take a chunk, the NPU will take a chunk, and the storage will try to take a chunk for caching if there’s anything left.
TL;DR: You should read the white papers instead of the marketing fluff articles.