Yeah they certainly have a writing style. I prefer to use it in a more detached way, as more of a critique writer than an editor.

Inkshift.io seems to provide through critiques and it doesn't touch the manuscript, from what I can tell.

If you were letting it do the editing, it would be nice if LLMs were closely integrated with diff'ing tools. I guess they are if you use an LLM integrated into a software editor (IDE)