Will it survive Magento version upgrades?

Yes, by design. We use data:patch over InstallSchema, di.xml over class rewrites, plugins / observers over preference, and declarative schema for any DB changes. None of those rely on internal Magento implementation details — they’re the documented extensibility surface. The Standard Extension tier includes 14 days of bug-fix coverage; Marketplace-Ready includes 12 months of upgrade compatibility (we test on each minor + patch release and ship a compat patch if anything breaks).