I'm not sure lack of pushing has to do with refueling. IMO it has much more to do with the way everything is conceived: engine limitations, gearbox limitations (because they are so expensive and there's a budget cap), parc ferme limitations, mandatory use of compounds, tyre preservation and a long etc. Refueling creates different races in the same track, which is not really what people that prefer close quarters racing would like to see, but that's another subject.
Refueling also ensures that cars almost never wind up in situations where there is a significant pace differential.
In the current system if a front running car pits and comes out behind a mid field car that has yet to pit in the sequence, there will be a significant differential as the car behind both is intrinsically faster and has a tyre advantage.
With refueling the weight penalty far outweighs the tyre advantage and the car behind is usually only marginally faster (if at all) than the car in front who is much, much lighter. The car just had to wait until the car in front had to pit for fuel and get on with it in clear air when that happened. I remember at the start of 09 when Rosberg always qualified with a heavy fuel load hoping to pick up positions with the overcut (which was the way to get ahead, getting clear air with a light car was always faster), unfortunately for him this used to mean that when Button pitted from the lead he'd come out right ahead of him and despite Rosberg being faster at that stage it ruined his race as he couldn't put in the fast laps when he needed them and had to drive at Button's pace until his stop.
Then add the fact that there is little to no fleixibility on strategy as it is 99% of the time faster to stay out until you are completely dry on fuel, meaning you are locked into your stint as soon as the fuel hose disconnects.
94-09 had by far the least on-track overtakes (1993 and 2010 were almost exactly the same IIRC, both around twice the amount of overtakes per race as the 94-09 era) and the races were incredibly static in nature, everyone just waiting for how the pitstops would play out.
Edited by A.Fant, 17 July 2021 - 17:40.