It took far too long to come up with effective solutions for this, and the ones that did exist, like the A2024 grayscale square-ish megapixel pixel display, noninterlaced, were too late and had too many compromises.
The Amiga had an uphill battle against the head start mac enjoyed ( and seemed, to the casual observer, rather naturally suited to with its crisp black and white display) in DTP to begin with, and without a native laser printing, a good scanning solution, enforcdd UI consistency through quickdraw and most of all adobe, there was never a reasonable chance that it would seriously challenge Apple in that market.
The unsuitability of a very visibly interlaced display to fine detail black and white layout work insured it would never be tolerated by people who had to work with such tools 8 hours a day.
Totally agree about the absence of a pennies per unit midi port as being a damnable error on Commodore's part; likely one of the main reasons the non-pc market was fatally fragmented three ways instead of a possibly manageable two, and gifting the ST (which was in all other respects an admirable me-too effort at best), a lifeline by which wedge itself into the nascent multimedia production market, which really would have been better off entirely associated with one or two platforms rather than two/three.