Typically, the design theory for DAWs on stock plugins is to be as economic as possible so that they are useable for a wide range of users computer systems, and to also not have too many performance-complicated features like 24x over sampling that may cause users issues of which they don’t have an understanding of which causes them to send in support tickets or complain on the forums.
So in theory, possibly some heavy duty pitch plugin could be created, but that’s not the objective of DAW stock plugin design… Most people don’t have Hadron-Collider data analysis level computer systems to run a high-quality pitch plugin at near real-time speed.
But also, this sort of a matter of physics. When it comes to pitch shifting - higher is always easier to accomplish because you are making a sound shorter. Lower is more complicated because you are elongating time, or essentially creating time/sound waves that didn’t exist. Theoretically, you can’t make a sound longer in real-time without warping our time reality itself… which is what the latency accounts for… If a sound wave is 1000hz/1.125ft in length… How do you convert it to make it 4.5ft (250hz) in length instantly? You are creating cycles that are longer, that don’t exist.
This is why even pitch shifting guitar pedals usually have a bit of a slap-back delay and a metallic cloudiness to them. Many are actually synths in which there is a decay amount.
You’re creating a circular argument. No one said Spectralayers is a composition tool, but you’re also ignoring todays reality of sound-design being a big part modern composition… Not to mention, having an understanding of instrumentation timbre is part of composition and can be edited with a spectral editor.
But Cubase isn’t solely a composing tool - if it were, it would just be Dorico and Cubase wouldn’t exist. People also use Cubase to edit and mix their compositions, and master - of which spectral editors are an essential professional tool. Nearly no industry competitive editor, mix engineer, mastering engineer, post-production engineer, dialogue editor/mixer, sound-designer is working without a spectral editor. Sometimes it’s not needed, but if in 100 projects you haven’t used a spectral editor, then the vocals you’re working on probably aren’t competitive engineering wise. Just curious, have you ever worked on dialogue professionally?
Obviously Cubase has evolved to not just being a composition tool - it’s an audio editor, mixing environment, sound-design environment, etc.