|>>|| No. 12503
Like you say, it's a solid, dependable biscuit, but that by no means makes it the best.
It's very much like a Volkswagen Polo, or a girl with a dodgy face but a decent body. It'll get you where you need to go, but it's hardly going to be memorable, or get your blood pumping. It's objectively not the best biscuit, it's the median biscuit, a benchmark biscuit. It's fine, it has universal appeal, but nothing to write home about.
Biscuits, like all art-forms, can never truly be ranked, merely observed and appreciated. But to suggest such a plain and, let's be honest, boring biscuit is the pinnacle, that's just foolish. I'd also argue that everything you claim a rich tea does the best, a digestive does slightly better.
I will refrain from fighting in any one biscuits corner as I have quite adventurous tastes (orange creams, viscounts) but to say the very essence of a basic, middling biscuit is the best is just insulting.