Re: Long Live Ingenuity!
I think there is a bit of a difference in the "wear and tear" in each case. For Spirit and Opportunity the point was for them to be there for a reasonable amount of time and to travel a reasonable distance to make it all worth while. With a combination of good design, careful operation, making everything a bit bigger/stronger (i.e. "rounding up" on the specs of everything they could) and, to be realistic, a bit of luck they vastly exceeded the design life.
But Ingenuity is a tech demonstrator. It is the smallest, lightest thing that they could build that could plausibly function. If it had failed completely it wouldn't have effected the primary mission (but would obviously have been hugely disappointing for the 'copter team). But the battery is going to get treated really harshly - it's in a very cold environment, it is going to get charged slowly over a day or so (whilst being partially discharged overnight to try and keep everything warm) and then it is going to get _savagely_ discharged during each flight. I'm sure they will be analysing the battery/power data really carefully and optimising everything they can but basically this is textbook "how not to make your battery last" cycling (well, at least the charging is slow I suppose). At some point (sadly soon) it won't be able to accumulate (and keep) enough charge each day to make up for the losses overnight and still have some spare to accumulate for a flight.
But, yes, here's hoping that they get plenty more flights before that happens!