Diamantina's convoy, amphibious, patrol, transport, and higher-threat escort work makes her a representative survivor of the class. River-class frigates provided enough capability in enough places to sustain the wider campaign. Their contribution was the daily work of the war instead of victory in a major battle. The design occupied a deliberate middle ground between bare-bones corvettes and expensive, specialist Black Swan anti-submarine sloops. The closing question asks what a modern navy should build in that same middle space once it can afford something better than the cheapest possible escort. The video leaves the question open for the audience to weigh the force-design and procurement tradeoffs.
Notable Point · 1:10:52-1:13:49
Waging the war and the modern escort question
The conclusion defines River-class value through affordable presence and asks what modern design should sit between a bare-bones corvette and a specialist anti-submarine warship.