GTO (Game Theory Optimal) sometimes have smaller open raise sizes in early positions (starting at 2 bb at some stack depths). There is a small loss in theory, but in practice, the guidance above might be better than GTO at lower stakes due to higher rake than in the GTO solution (in cash games) and for exploitative reasons. If players are calling with too many weak hands and not 3-betting enough, betting bigger than GTO exploits their mistakes. In more extreme cases (typically low stakes live cash games) it makes sense to increase open raise size even more, to 3-5 bb. It will also help decrease the number of multiway pots, which in general reduce the skill advantage.