I agree @Strawman turnover correlates with worse performance. Those that trade too often, usually getting nervous, jump at shadows etc, which leads to poor performance along with a massive transaction and tax drag. So I think the edge is not actually time, but rather patience/discipline.
As you say at the end of the day it matters what you buy, So poor picks will do poorly on any time frame. But if you can get to the point where you are making good decisions on a regular basis, that's when gradually increasing turnover makes sense.
I believe most people should default to low turnover especially to begin with, but there are studies that suggest that it is easier for intelligent decision makers to forecast short term events, as there is less scope for unseen events as uncertainty grows as a function of time (Take weather forecasting for e:g)
For a good stock picker, their best new idea will likely have a better return profile than the name they have happily held for 5 years.
Of course that is gross. It is more nuanced when you factor in the costs and tax consequence. That can often lead to sticking with the stock held 5 years being the best decision. After all net returns after tax is what matters.
Like most things in investing, the best balance is tricky to find and different for everyone.