Why is the virtual cockpit not available on all Audi A4 models?

I've been considering purchasing an Audi A4, but I noticed that not all models come with the virtual cockpit feature. Can you explain why this is and if it's worth paying extra for?

The virtual cockpit is a newer feature that was introduced in the 2017 Audi A4 models and has since become a popular addition. However, not all models come with it as it is an optional upgrade that comes with an additional cost. In terms of whether it's worth paying for, it ultimately depends on your preferences and budget.