One brush to rule them all?
No, I don't think so - think of brush ownership much like car or mobile phone purchasing.
We 'the majority of consumers' tend to change these items fairly frequently, perhaps as much as two or every three years. They'll obviously perform for a much longer period than that and no doubt do their jobs as they were intended but human nature dictates change or we seek to try out new or different things. It's how we are programmed.
I once owned a VW TDI Golf and it was just an all round solid vehicle, I loved it as a young man but my tastes have now changed.
iPhones are incredibly popular, I'm using one to type this as it happens - are they the best smart phone out there? I'm not so sure ... Well marketed, built & accessed I'd argue.
I've examined & tested brushes from just about every source on the planet - there are some beautiful choices out there.
Go enjoy! If you find 'that' brush, you are a better man than me.