It's definitely more elegant than mine, I didn't know such a module existed in a 3 pin package.

 

I agree, but the Zener diode is 30 times better!

Certainly, if there's significant noise or ripple on Vcc.
But a large decoupling capacitor at the voltage divider junction should also work to minimize that.

 

One of the problems with the post #1 circuit is that a source follower and an emitter follower are not the same thing. Among other things, there is a fairly rigid DC relationship between the base and emitter of a BJT. For small signal transistors this is often approximated at 0.6 V, although it does vary with base current, collector current, and temperature. The relationship between the gate and source is not nearly as ... convenient.

https://en.wikipedia.org/wiki/Common_collector (emitter follower)
https://en.wikipedia.org/wiki/Common_drain (source follower)

ak

 

It's definitely more elegant than mine, I didn't know such a module existed in a 3 pin package.

The TL431 is a cheap and handy device to keep in your bag of tricks.
It can be used both as a linear regulator or as a comparator (within limits) with a built-in reference voltage.

A comparator example is below: