I think the pattern is less "Tesla can't invent anymore" and more that the company seems much worse at turning ambitious concepts into mature, supported products
I think it’s both, but also they don’t even need ambitious concepts. They just need to make vehicles that compete in popular segments and become a proper full range automaker.
Tesla has no 3-row SUV/family vehicle, no subcompact SUV (Kia EV3), no city subcompact car (Renault 5), and no commercial vehicles.