> A 105 groupset is way more reliable (ime) than lower grades. Your gears will shift better, not click, not skip, and not drop your chain during your commute.

Really? I feel like my old 8-speed Sora bike needs far fewer derailleur adjustments than my newer 11-speed 105 bike.

I guess this is because the higher-end groupsets are lighter-weight and have more gears (so, a thinner chain and finer mechanical tolerances).