Strangler rebuilds
Pull one business capability out of the old platform, prove it, and expand the pattern.
Output: first production cut.
focus
Modernization uses staged cuts, adapter layers, controls, and migration paths led by people who have carried platform rewrites in production before.

what gets shipped
Pull one business capability out of the old platform, prove it, and expand the pattern.
Output: first production cut.
Make migration observable, reversible where possible, and boring enough to trust.
Output: cutover plan and release gates.
Leave internal teams with the architecture, runbooks, and confidence to keep shrinking the old estate.
Output: build handoff.