Legacy sistemi su neugodni ali često vrijedni, oni pokrivaju posao. Odluka za refaktoriranje, zamjenu ili umirovljenje mora biti vođena troškom i vrijednosti, ne odbojom prema staroj kodu. "Staro je i ružno" nije razlog; "skupo nas stoji" jest.
Zašto je to važno
REFACTOR (improve in place) when:
- Core logic is sound; it's holding business value
- Problems are localized; you can improve incrementally
REPLACE (rewrite/migrate) when:
- It blocks important work and can't be incrementally fixed
- Maintenance cost > rebuild cost over a sensible horizon
- It's a growing security or reliability liability
RETIRE (remove entirely) when:
- Its value no longer justifies any maintenance cost
- Usage has dwindled; a simpler path exists
