Yes, the 1980's was a great time in the motorcycle industry, progressing from air-cooled bikes, to water-cooled and air and oil-cooled (Suzuki GSXR) bikes, from 2 valves/cyl air-cooled to as-many as 5 valves/cyl (Yamaha FZR 750/1000 Genesis). From mild-steel to wide aluminum beam frames, traditional forks to USD forks; twin shocks to monoshocks. From bias-ply to radial tires, which helped as top-ends went from barely 140 to 170 mph.
The Madura was a 'me-too' attempt to field a bike like the V65 Sabre and closest-to the V65 Magna, but it never had much success in the marketplace. It's never going to have the interest that the 'Max has because of its smaller production numbers, and the short time it was a current model. I'd liken it to the Cosworth Vega, a limited-production model that had some good specs, but just didn't have enough lasting power to stay relevant in the marketplace.
I think the Eliminator 900/1000 had the best opportunity to stay in the market, because of the Ninja roots, allowing the engine to easily be hopped-up.
Remember that the early 1980's was when Yamaha decided to assault Honda's #1 place in the market. The number and types of motorcycles introduced into the marketplace provided a variety of motorcycles never-before seen from major manufacturers. Then there was the recession, and the Harley-Davidson lawsuit against Japanese 'dumping,' the government's tariff on Japanese bikes resulting in the 750's becoming 698-699cc 'tariff bikes.' H-D was trying to buy itself out from under American Machine and Foundry (AMF) by a group of employees headed by Vaughn Beals and Willie G Davidson. They struggled to find financing, and came within less than a month of having to liquidate the H-D brand. How the market would have been different, if they had been dissolved. H-D in the USA, with the arrival of the Evolution powerplant, became the nation's largest seller of large-displacement motorcycles, and that includes the V65, VMax, Eliminator, the Madura, the V-twin cruisers and all the 'literbikes.'
If you are interested in the timeframe, and the history of the motorcycle manufacturing industry, Harvard Business School (HBS) has a case study of the Harley-Davidson turnaround, it makes for great reading.
Harley-Davidson: Preparing for the Next Century - Case - Faculty & Research - Harvard Business School There are a number of HBS papers on Harley-Davidson.
https://www.hbs.edu/faculty/Pages/item.aspx?num=47467https://www.hbs.edu/faculty/Pages/item.aspx?num=7084https://hbswk.hbs.edu/item/what-should-harley-davidson-s-management-dohttps://hbr.org/2017/05/how-harley-...tics-to-increase-new-york-sales-leads-by-2930https://phdessay.com/harvard-business-school/