Yep, the materials used were the issue. Drivers were begging fans to return any aero that came off their cars during a rally as they cost a fortune to replace.
I dont agree. If FIA and promoter works properly and has anything to offer, I am sure we should have 3-4 manufacturers (which is enough for proper championship)...
Mismanagement? They were bound to the decrees of Politicians and the Princes of Finance. 17-19 was class because of 4 teams all equally capable with a spread of talent. Wouldn't see that again...

The Americans are going their own way with this new cost-effective alternative to European Rally2 Cars... https://www.jrdmotorsport.com/arc2araspeccarupdates With development and testing help...
WRC mainclass from 2027