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Well, the correct way to decide is to create a testable hypothesis that differs in outcomes between taking care of aging batteries and planned obsolescence, and then test it.

Hypothesis: If they wanted to take care of batteries/battery life, the phone/tablet would resume running at full clock speed when plugged in and charging.

Test outcome: This is not the case.

Verdict: Hmmmm...

Apple could just install batteries with 50% more capacity that can survive a full day of use even if the phone is two years old.

They do (source: my iPhone 6, bought on launch easily survives a day of heavy use)

On the other hand, my 6, same purchase day, can barely survive a full day of light use, and requires additional charging throughout the day if I'm calling or texting much

If this were true it would be a user option, not hidden and unchangable.