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Why does the `.max()` and `.min()` methods have been removed ?

Ambiguous and replaced by minOrNull and maxOrNull

Assuming you're talking about Collection extensions

<https://kotlinlang.org/docs/whatsnew14.html#new-functions-for-arrays-and-collections>
&gt; •  The `min()` and `max()` functions have been renamed to `minOrNull()` and `maxOrNull()` to comply with the naming convention used across the Kotlin collections API. An `*OrNull` suffix in the function name means that it returns `null` if the receiver collection is empty. The same applies to `minBy()`, `maxBy()`, `minWith()`, `maxWith()` – in 1.4, they have `*OrNull()` synonyms.
the plan is that, in a future release, `min()` and `max()` will return with non-null types, but they need to be hidden for at least a whole release cycle first to ensure a safe transition

see <https://youtrack.jetbrains.com/issue/KT-38854> for more discussion