There are three stances that I can see in the debate at the moment.
* Quantity has a quality all of its own.
* Innovation and agility allows you to adapt and survive.
* Low capability platforms often can't be used to deliver useful effect & commanders will try every option not to use them in a fight. When they get committed it can be disastrous.
The first two clearly have merits, but every military professional I have ever worked with has cited them at me, so I don't think that they are underweighted in discussion. I believe that the last one is not treated with enough weight in the debate. The best example I have of it is the Russian Black Sea Fleet. Platforms with glaring problems, fielded and maintained at huge cost, completely unable to achieve their strategic purpose. Even when sulking in port these ships have proven to be deadly for their crews and maintainers. Another example is the TB3 drone. It had a staring role for about 10 days in the Ukraine, but those were 10 days where the Russians ran out of petrol to run their air defence systems on. It hasn't been in evidence since because it just can't be used in the current environment.
One that worries me is the upcoming T31 (uk arrowhead variant) frigate. The argument for it is that it is a relatively affordable platform that the RN will have enough of to actually be able to get out and about. However, it doesn't have a sonar, so... what actual use is it as a frigate (I know the story about the helicopter and some other bits and bobs... but... really?)
Sure, when the other side has run out of the good kit dragging crap out of storage might work, but until then you are going to be sending good men to their death in second rate equipment. Is that going to build war winning morale?
Second rate equipment is for playing lets pretend, or for fighting wars of national survival. We should avoid both.
Quantity has a quality *if* it can get to the battlefield.
The big stuff is for trying to keep the small stuff away from the battlefield. When you can't do that for whatever reason you need a bunch of small stuff of your own.
But a frigate without sonar isn't inherently horrible--lots of places don't have subs.