Shopify recently Increased limits in metafield and metaobject definitions
Basically, for metaobject entries:
The 1,000,000 entry limit per definition removes previous plan-based restrictions of 64,000 (non-Plus) and 128,000 (Plus).
128 definitions for Basic, Shopify, and Advanced plans for a merchant
It looks Shopify is encouraging merchants and app developers to fully leverage its metaobjects instead of using external storage.