I think dropping the battery to a low level is probably worse than charging to 100% on an iPhone. For most fast charging (up to 80%), an iPhone can get quite warm. Heat is the number one enemy for battery life in an iPhone, so charging from a very low level means the iPhone will stay warmer for a longer period of time (with fast charging). Once the battery is charged to 80%, the charging is slowed and the heat buildup disappears.Keep in mind that running the battery very low can be just as or more damaging to the battery as keeping it at 100%
We have 11 month-old iPhone 13s that we use with Apple's 20W fast-chargers and Apple cables. No problems whatsoever.
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