Not presenting something publicly doesn't necessary mean some company isn't working on some solution.

Sometimes some carmaker shows / introduces some solution first - but it can happen some other manufacturer is working on the same solution for even longer period of time.

Eg. BMW have been working on turbo engines for a long time but waiting for the best possible time to introduce the engines again. It's also about marketing strategy, financial possibilities (development budget), etc.

To understand moves of certain companies a lot of aspect should be considered. Incl. trends, marketing strategy (incl. brand values), financial aspects (R&D figures, purchasing power of certain company, costs of certain tech / materials etc).

Like said many times: today almost all large companies have technological & engineering possibility to develop anything. Yet they are usually limited by budgets & marketing.