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Do you think they should or they shouldn't? And with what reasoning?

I thing they should. Otherwise both 1 and 2 point to the same API but have different explanation. If I want to use the junitplatform only (without applying framework dependencies), then I have to call https://docs.gradle.org/current/dsl/org.gradle.api.tasks.testing.Test.html#org.gradle.api.tasks.testing.Test:useJUnitPlatform(). But the docs says I have to call different method.

Yes, both point to the same api and have different explanation, as they describe different aspects of this call. Consider the sentence right in front of those two points:

Unlike the methods on the Test task, JvmTestSuite methods perform two additional pieces of configuration:

Maybe my english is not good enough to understand the docs, but how could one method do two different things?

It does both things

Another reading and I get it now. Thanks for your patience.