It's putting all eggs in one basket. If/when the higher-margin category collapses, they'll have no fallback. Imagine Chevrolet had discontinued Impalas and other low-margin cars, and switched to Corvettes during the pandemic
Good description of what actually happened. Do they even sell any conventional 2-door passenger cars besides the Corvette these days?
Even if there's a collapse in the high-margin market (I don't think anyone is expecting this right now), it will be slow and telegraphed in advance, giving them plenty of time to refocus on lower-margin products.