I take issue with the term "temporarily." Since the issue, practice, and execution of the slow down was never made transparent you cannot determine the amount nor time the phone is slowed. As to my preference that's not what is being discussed but I would prefer the occasion restart failure over a constant throttling.
The snafu was Apple hiding this practice from the end user and not allowing them to make the determination as to which outcome they'd prefer. Furthermore the creation of the slowdown is an admission that their hardware has an 18-24 month effective life due to the limitation of the battery irrespective of other handset makers. With a closed case and Apple's preference to not allow 3rd party repairs this very much appears to be planned obsolescence when you consider the lack of transparency from Apple.
Now that doesn't mean that I disagree with their solution; it was the implementation that was the error. As an owner of 4 iPads I'd prefer to set them to shutdown until the issue becomes irritating then set the device to throttle as a fix. I doubt I'd repair the older ones since they cost less than $250 to replace, keep getting faster and have more storage. My original mini 2 is getting quite long in the tooth.