he doesn't need a lot of things to make beer that isn't the best beer possible. he doesn't need to aerate, or have good sanitation, or deal with chlorine/choramine. he doesn't have to ensure proper calcium or ph in his mash, he doesn't need to measure his hops or worry about their AA. he doesn't need to control the temperature of fermentation, or any other number of things. He will still make beer.
but if he wants an assured method of brewing better beer, then the answer, especially for a 1.059 OG beer is yes, pitch the proper cell count.
"Consistent, high-quality beer requires precise measurements. One of the most important measurements, especially in terms of fermentation, is pitching rate. Without consistent pitching rates, flavor can change significantly from batch to batch.
"What are the consequences of overpitching or underpitching? In general, underpitching affects flavor more, while overpitching negatively affects yeast health more over generations. However, both can result in a less than ideal fermentation with high levels of diacetyl, acetaldehyde, and low attenuation." Yeast p121.