Strictly speaking, what got the negative result was light, cheap cruisers. The Attenborough, for instance, rather fails to be cheap; we stuck a lot of gun on it.
Some of what we could do to meet the "not light cruiser" requirement is to build noncombat frigates; this was actually a suggested action the last time we got the "stop building insufficiently armed cruisers" warning, though we didn't take it.
But fundamentally, the problem was that we let our designs drift below a critical breakpoint in military capability, and we're going to have to keep an eye out to not do that - especially since that breakpoint is likely to rise with technology.