John Smith wrote:

Wes:

Those osc are a thing of the past...

Bring a junk am broadcast radio near your computer, you will hear literal
dozens (well, a bunch anyway!) of osc's freqs going on there, probably not one
being generated by a colpitts, hartley or pierce osc circuit...
And, with the proper processing, all those waves could be a sine...

John

Each of those oscillators use a crystal for frequency and stability!
Each of those oscillators uses positive feedback so that it oscillates.
Draw the equivalent circuit of those oscillators and you will find the
COLPITTS circuit !!!!

I wonder if you are confusing the Coplitts/Hartley topography with the
old VFO which were/are variable tuned [Colpitts/Hartley] oscillators.

Every digital frequency synthesizer uses a Colpitts oscillator as the
reference oscillator, at a fixed frequency, and the variable oscillator
is digitally phase locked to it.

The basic Physics and governing laws for oscillators has not changed.