Do Turntables sound better with time?

I agree that we accommodate to the nuances of our components over time. At the same time it could be possible your system/turntable has found its groove so to speak. Probably a little of both.

I've recently made a few changes and to be honest have experienced some recent synergistic improvement. I don't care for the idea of burn in, seems like a huge inconvenience, especially considering the tube life is paying the price. But things seem to be settling in. We obsess in this hobby. We are so fortunate. Must say the incremental improvement is a pleasure in itself. Glad to hear your experience is bringing some satisfaction.

Turntables don't "sound" anything,

No. Your brain just gets used to it. Some folks think their turntable sounds worse as it ages. Depends on what you're drinking.

@secretguy 

thats because you didn’t plug it in

@perkri    "Not surprising. As has been stated above it’s a mechanical device, and most mechanical devices break in as parts set/wear into each other. My BMW S1000RR was limited to 9000 rpm for the first 1000 km. Then oil change, tune up and the full 17000 rpm was made available."

It is not best practice to limit your bike to about half revs for the run-in period and then immediately whang it up to the red line.  What is required is a gradual increase in the revs used.  So after 1000km, have some brief sorties to 12000 and then back to 9000; then to 14000 for a while, and so on.  For a further while avoid really hard acceleration in the upper range and pushing the bike going uphill.

But it is true that engines need much less rigorous running in these days as the parts are machined to far smaller tolerances.

Interesting about the oil change recommended by BMW.  When I bought my Porsche 997 GT2 (a very highly performance engine) all of 14 years ago now, Porsche said it was not necessary to change the oil at all until 15000 miles.  I had them change it after running in.  Oil is cheaper than engines.  In my Macan, bought 2018, they said the oil is good for 20000 miles.