Some of those names I recognise from other IT-related products (Mendocino, Catalina, Monterey...). Generally speaking, naming products after CA landmarks has been done for 30+ years in this industry, it just feels very unoriginal. I think it's a desperate attempt from Apple to remind you (or themselves) that they "design in California", despite manufacturing in China, selling in Europe, and stashing profits in Bermuda; and to suggest the OS is "hard as a rock", as opposed to the wobbly and airy "windows".

I very much preferred the big-cats theme. It humanised the OS in powerful ways, making it an extremely powerful and very intelligent animal that dominates through speed and elegance. Rocks are just dumb and static.