I think all the answers about ‘just »open with« a full fledged writing app’ work on the grounds that the authors here assume for themselves; this seems to be a) full writing / DTP / authoring experience; and b) working on the desktop (basically).
the issue I think posted / propsed – at least the one concerning me – is different in character. (and in some cases this seems hard to get through, as people rather think on their grounds instead of poster / proposals inherent grounds):
the case to mildly ramp up the editor experience (in my case mainly: MD) for a) more regularly, but low structure input becomes especially problematic if you a) make DT central piece of your note taking (which some people including DT team assumes as one possible scenario) and simple writing down, and b) want to have some consistency and frictionlessness across devices (desktop and iOS).
… of course it can be debated, given the ambivalencies underlying the DT ecosystem, whether this has some priority vis-a-vis other scenarios and other desirables. granted.
– but I think it is important that the case constructed in some minds against the whole impetus of this proposition growing out of use cases / needs of some users, is based on partially wrong presumptions (basically rooted in other(s) use of DT)…