You arent really meant to simply swap production anyway. It is much better (even tho more industry and resource intensive) to produce the new and old stuff in paralell and slowly gearing up production of the new stuff, while slowly gearing down production of the old stuff. You might even want to produce some stuff for the entirety of the war. You can always tailor the older versions to different specializations. For example making the PzIII a great, fast breakthrough tank while focusing on tank-on-tank combat with the PzIV for example. Especially since you can filter what equipment divisions use, you could quiet easiely do that.You lose 25% of your factory efficiency by updating the model on the production line. That may not sound like much but its probably something like 5-6 months worth of gearing lost. It would be far more efficient to simply throw all of the points into the latest model of tanks researched and instead just taking the 75% loss for switching model within a class. Also maxing out all four stats will impact heavily on the reliability of the vehicle. Reliability only goes to 5, and each of the other three stats reduce reliability an equal amount. Basically you can only have one stat (gun, engine, armour), maxed as well as reliability in order to have the same reliability of the default model. Otherwise you will incur more vehicle losses through attrition. Its basically simulating over engineering in the vehicle.
In short you want the xp for major milestones in your research that you are intending to stick with for a while, or perhaps in more dire straits upgrading a vehicle which is obsolete but you cannot sacrifice the full 75% of its production gearing to switch the model of. For instance if you were russia and needed every tank available but your gun or armor aren't quite cutting it. An interim measure.
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