Given the illustrative thread patterns it seems save to assume that the issues/challenges around the fine asides-annotation feature/capabilities and it´s rather suboptimal UI-implementation (especially from perspective of less technically-inclined users) will neither be acknowledged nor addressed in any forseeable future.
So, for people still interested in having this powerful feature set disposable in some more compact and intuitive form for daily/habitual use (and not from the coders or tinkerers department), I post my workaround to at least have some kind “solution” as of closure for this “communication”.
It follows the hints laid out by FrankT, which means it relies on 3rd party apps and some (modest) tinkering investment, plus one probably critical ‘insight’:
One can use Keyboard Maestro (or some pendant), and put the critical parts of asides-annotations – creating, writing, finding, reading – into two shortcuts:
- shortcut for creating/writing – the tougher one:
here one needs to be aware of the fact that DT at the moment doesn´t have direct menu-access to creating aside-annotations (one of the up to here unacknowledged parts of the “debate”). One can still create a shortcut knowing that the one triangle in the sidebar (Info-panel “Annot.” > “Annotationen”)
a) allows for creating/triggering these,
and
b) is adressable as a button to interface automation tools like KM.
– … then, one has of course to simulate some cursor movements by triggering keyboard-arrows for movement/selection and a final “enter”)
So, using "Click button : “Annotationen” after "shift focus to panel “Info-Panel - Annotationen” (via Tools-Inspectors-Annotations&Reminders = “^ 3”)
- shortcut for script “open annotations” – the easier one:
script was re-provided by FrankT above in the thread (you have to look up ways to install it, as it is not to be found in the script-extension library yet)
This to me is the only way to get the whole process around aside-annotations somewhat streamlined and sane, as it puts the core of it (creating, writing, finding, reading) behind two – additional – shortcuts.
It of course is only a workaround (not a real “solution”), especially as it doesn´t address the visual scattering of this functional complex in the UI.
But it is what it is, and here we are. 
Fare well all you non-techies,-coders, and -tinkerers out there!
And enjoy the power of annotation in DT! 
//
– Particular note here to @anton , @Amontillado , and @Kevin (maybe also also helpful for @ethanw6258 and/or any lurkers here, which are into annotations and UI/flow improvements )