I'm not crazy, the attack has begun.
You can expect any half decent engineer would. But decent engineers aren't the ones who specify the technicalities of cars. Accountants and project managers do that.You would hope that any half decent engineer would be well aware of PHEV battery usage patterns and "pad out" top and bottom appropriately so it's never anywhere near true 0% or 100%, and implement the best practices to manage as best as possible a PHEV batt's life. Remember, these batteries are never "supercharged", so nice gentle charging.
Fortunately, at least the Volt/Ampera was designed reasonably by engineers before anyone with a sharp suit and a calculator figured out what they were actually up to. Regrettably, then the 'trick' was spotted! "Whaaaaatt??? You've been giving customers properly engineered cars that last beyond the warrant period!?!?!? Disgraceful! What will our shareholders think! Next thing you'll be expecting us to make cars that our customers actually want!"