It's a cost problem. You can absolutely get higher availability, but it requires more hardware, uses more networking, and it makes maintenance and feature devel

It's a cost problem. You can absolutely get higher availability, but it requires more hardware, uses more networking, and it makes maintenance and feature development more expensive. Blob storage customers are very price sensitive, but they also want lots of availability. That's why you'll see various "tiers" of storage, to try and capture all the combinations of availability and storage cost that various kinds of customers might want. Pretty much nobody wants to pay twice the cost to turn an exabyte of 99.99% available data to 99.995% available data, so it's not a product.