> and there were some incremental improvements along the way (first the A3000 and then AGA A4000/A1200 in 1992)
About the A3000 Wikipedia says “The machine is reported to have sold 14,380 units in Germany (including Amiga 3000T sales)”, and about the A4000 “The machine is reported to have sold 11,300 units in Germany”. Both were on sale for about 2 years.
In comparison, the A2000 sold 124,500 units in Germany, again according to Wikipedia, in the about 4 years of its commercial availability.
So, about a 80% decline in sales per month, in what I think/guess was an expanding market for personal computers.
⇒ I don’t think those improvements made much of a difference.