It's hard to build an oscillator

I was hoping this would go more into startup and amplitude control, which are for me the tricky parts of building a phase shift oscillator (because you have to analyze the non-linear behavior).

I guess hobbyists nowadays are just using SI5351 and calling it a day.

Most use GPSDO references for equipment, as they are inexpensive. Even miniature TCXO tend to still offer quite good value these days. =3