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This is why A/B testing is important.

Actually, it' why A/B testing is rife with false signaling. ;-)

It doesn't say anywhere that they used A/B testing, let alone proper A/B testing.

I have never seen reddit apply any kind of A/B testing. Never heard of them doing this.

A/B testing is supposed to be preceded with A/A testing to help with that though?

Doesn't really help.