Exactly. Even basic techniques have varying levels of skill and effectiveness. Oro used lots of kawarimi techniques...in addition to the skin-shedding one, he also used a mud-variant one several times during the chuunin exams / hokage fight.

Same principle applies for bunshins. Rarely will you see a higher-level ninja use regular bunshins, but water or kage bunshins are common among even the strongest ninjas.