@northman, you are asking good questions.
The D&D 8c Loud speakers will work very well in a very difficult placement (that is close to a wall or in the case full length glazing).
The question of 'compromise' is simply that too close does effect how well the (more typical) Loudspeaker will perform.
And you are right that this is great fun especially with regard to what you want to accomplish.
Throw as many questions as you like my way ... keep working through this until you fully understand what you want to know.
Loudspeaker design is all about compromise in a sense.
I don't think that I can answer the question in one sentence though.
is there a good way to know whether a speaker is forgiving about placement?"
The Dutch & Dutch example is meant help visualize more than to argue
for or against a type of gear.
An Active-Powered speaker is a whole different direction from passive.
But it helps illustrate a point.
Could I suggest another visual aid (Real Audiophile)? Youtube video: