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Slower presets are not setting "how hard to try to get the quality". That doesn't even make sense, speed settings don't change any quality metrics, that is what CRF sets. A Slower preset allows x265 to test more encoding methods (it always picks the most efficient method) but it does not make it want to preserve detail any more or weight quality v.s. size differently.
Do you have any sources? I think this is one of those wrong urban legends based on bad testing (using CRF encodes) and misunderstanding how x265 works. Also the desire to say the faster preset is better quality is pretty tempting if you feel like you should use the best quality possible but don't actually want it to be that slow. Sour grapes, if you will.
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