The fact that this was never communicated to users is what's the big issue here. Users may not know that their battery performance is degraded. And even if the

The fact that this was never communicated to users is what's the big issue here. Users may not know that their battery performance is degraded. And even if they knew, how would you expect the average user to correlate bad battery health with low system performance? Apple should have notified users of battery health issues (they do so on MacBooks, for example) and the impact on system performance.