Why a modernized Tribal hull becomes an OPV

How viable would modern weapons be on a Tribal-class destroyer hull?

The small, crew-intensive hull would offer only an offshore-patrol-vessel level of modern capability.

A Tribal hull is small by modern combatant standards despite its destroyer designation. Sensors, missiles, power generation, accommodation, and damage-control systems would compete for limited space and weight. The historical machinery and operating model would also require too many sailors for the capability delivered. The realistic result is an OPV-like ship rather than a modern destroyer.