So sims can have the shy trait which makes them less eager to introduce themselves to other sims. I usually don’t play with that trait on my sims, but they always tend to walk between the bushes and the walls when I tell them to go somewhere. In this case, my sim was on one of the adventure quests where she has to ask one sim to go on a date with another sim. I guess she really didn’t want to ask the sim out.
In the reports that I saw from SimsCamp at Gamescom last summer, routing is one part of The Sims 4 that will improve over The Sims 3. Sims are supposed to follow the paths and sidewalks that are already there, so we shouldn’t see sims walk behind bushes like this.