Lets assume the power/weight/cog difference is there and the team saves money on test-mules, not benchtesting every mod for 5000km.
Starting from P20, the midpack laps 1-2s slower, you would lose 30s before the first pitstops. Even staying out, wouldn’t bring you to P1 in most, as the lead car would pit en return on the track in front of you. Tyres worn from driving behind midfielders, fighting for positions, will increase laptimes also. Maybe engine speed, but tyres left to overtake. Now you take a pitstop as late as possible, putting you back +20s behind the race leader.
To win the race you have to lap 2s faster than race leader AND fight with guys like Verstappen, Alonso, Ricciardo, Hulkenberg, etc. at the same time. Finally try to overtake the race leader who was cruising and saving tyres, engine, etc for most part of the race.
But building 84 powerunits per tram, by hand is excessive AND the fuel flow limit, will make the available powergain to small.