A good source of power and connections with shoes makes a difference in the audio.
Since we are also dealing with analog it's not perfect like a digital signal. Unlike analog which is effected by a lot of different variables including real world variables we have no control over. We are tuning with digital devices which allows us to see and hear the frequency. We can fine tune the signals using our phones. 100 years ago it was a pair of ears and a tuning fork.
Try to fine tune with a guitar tuner to a close enough approximation and then close your eyes to finish the tuning. This is where creativity comes into play.
This looks like a limitation in the occilator but we only have so much control over analog inputs and outputs. That's why analog creates character or a unique timber. This is the strength of analog because our bits will never have exactly the same because timber. Like most analog instruments
Think about it.
Why don't all guitar brands sound exactly the same?
Why does my monotron have to warm up longer in Colorado than in Texas?
Why doesn't my Korg filter sound exactly the same as my moog filter?
Why does a record sound warm and CD quality perfect?
How many licks does it take to get to the tootsie roll center of a tootsie pop?
If you want absolute perfect go digital. Digital Software sounds the same on all PCs. Analog is not perfect just like people... unique.