No. Some of them do look dated and are out of fashion.
I grant you that if popular people started wearing brooches again, more ladies would wear brooches.
But I remember a time in the 80s when brooches became popular again. I have some treasured (UGLY, but beloved) brooches from the period. I also bought a number of Estate brooches from jewelers, because ether were affordable and appealed to me.
Today, they look dated and out of fashion. I save them because they mean something to me. But some of them are just ugly. And I know that because my taste improves with age.
Her Majesty's brooches look great on her. But many would not suit members of the family. Styles come and go today so fast that nothing sticks (based on its inherent style alone). The good stuff cycles back into and out of fashion. But that's not true of all her brooches. JMO.