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The DOM API is clear enough that silly abstractions like "selector engines" are unnecessary.

The C vs. Assembly argument is such a silly non-point; apples and artichokes.

Selector engines are clearly not silly abstractions otherwise all major browsers would not have implemented querySelectorAll.

…which is a façade for the existing CSS engine. Developers clamoured for it (right or wrong), and it was implemented.

But since they did, why use jQuery on mobile when 100% of mobile browsers support querySelectorAll?

Hilarious that you think that one of the core features of the most successful JS library in history is a "silly abstraction".

And JQuery is much more than just a selector engine.