>pretty easy currently

The use "currently" itself should set of a number of alarms in a sane person.

Then, to top it, you add: "showcases a number of techniques".

Centering should be an built-in, simple, capability. As simple as making some div red or adding a 2px border.

Not a "technique" or a "workaround" and surely not "many of them" (incompatible and each with different tradebacks).

You don't see "techniques" for making divs have a certain background color -- that's because there's a single instruction for that, and it bloody works all the time.