The reality of application modernization and application migration

Application Modernization and and application Migration often was mis-interpreted by many people however over the years , i've seen hundreds of application modernization efforts , that i would like to highlight the differences and factors around these , i try to summarize the Key Difference at Glance

Application Migration
Move the application from one environment to another - usually from on-premises to cloud - with minimal changes
Typical patterns :
Life-and-shift (rehost)
Replatform (small tweaks, normally change services using new infra/cloud services e.g move on-prem SQL to cloud native SQL service)
Goal : Change the underlying location of services , upgrade runtimes , not fundamentals changes.

Application Modernization
Transform the application's architecture, code and operational model to take advantage of modern cloud native capabilities
Typical patterns:
Refactor (rewrite portions)
Re-architect (monolith -> microservice)
Rebuild (significant redevelopment)
Replace (move to SaaS)
Goal : Improve the application's capabilities , agility and long term value.

Key Differences at a Glance

Area Application Migration Application Modernization
Primary Purpose Move to new environment Improve and evolve the application
Effort Low to medium Medium to high
Change required Minimal Moderate to extensive
Time to value Fast Slower but higher long-term impact
Risk Low (if life-and-shift) Higher(due to code/architecture changes)
Cloud benefits realized Basic (VMs, IaaS) Full (Containers, Paas, serverless, DevOps)
Cost Impact Reduce infra cost (Maybe), but tech debt remains Reduces tech debt, improves performance and knowledge innovation
Ideal for Quick exit from data centers Digital transformation, IT Modernization roadmaps