Incorrect, bro. Microtonals (aka tuning) is for timbre. Most real instruments produce a distribution of frequencies across the desired pitch. On a spectrograph you'd see a bump rather than an infinitely thin line at the desired frequency. These bumps are typically wide enough to hide the detuning inherent to TET. High spectral content also works to hide detuning, even if the overtones are themselves quite narrow. But if you have pure sine waves at specific frequencies any detuning becomes VERY apparent in the form of beat notes. The closer an instrument gets to pure tone, the worse detuning will sound. So while microtonals on a snare drum are indeed for autists, they are absolutely necessary for additive synthesis, autotune and vocoder filtered sounds, and some real instruments with simple harmonic content.