Here's what you need to know... and why I program a variety of training techniques through periodization to change your physique.
People who only lift heavy or only do Olympic-style lifting rarely have impressive arms and shoulders. The exception is heavy lifters who include high-rep, isolation work.
Doing only the big basics can lead to strength imbalances that will ultimately impair your performance and size.
Trisets, supersets and giant sets cause muscle contractions which restrict blood flow and lead to the release of local growth factors. Thus better overall development.