That's what Locally Recoverable Codes (including Pyramid Codes) are designed to address: you can repair a missing block using only a subset of the blocks, which you can make sure are placed in just one zone, eliminating the cross-az bandwidth requirements. Sure, if you lose multiple blocks, you are going to end up needing that extra bandwidth, but the chances of having two blocks offline at once is very low -- if it's just for a failure rather than extended maintenance, then you have probably already repaired the first block by the time the second fails.

In fact, the RS configuration is often in the >50 data blocks and >10 parity blocks range (albeit with an LRC/nested RS config) for object stores because it's more important to have that recoverability than repair efficiency. While one large provider I worked at did have a system whereby they did effectively have two copies of the RS-encoded data (so that 130% turned into 260%) across two AZs, they were actively in the process of swapping to the blocks being evenly distributed across the AZs, near-halving the total required disk space.

As I said before, most object storage is not on SSD, it's on hard disk: it's 20% of the price per TB, and most objects are read very infrequently. I can promise you that they're not paying $200 for 1TB of SSD either... I realise prices are higher than sensible in the last 6 months, but it was fairly easy to pick up SSDs for under $50/TB at retail pricing (and hard disks for under $10/TB) only a year ago.