I also agree that bringing down the size of Metafields from 2mb to 16kb is really big difference. I am wondering though is this change only affecting when we use the api version 2026-04 and above? Or is there a hard date when this change will take effect in all versions?
Also this has not been announces (or not in the changelog or that I have seen yet). But I saw UI extensions files size are also being reduced from 2mb to 64kb. This is also another enormous change which should be discussed as well. If its an issue for metafields, its an even bigger issue for UI Extensions. That size is way too small.