Yes, the set also takes quite a lot of time to finish. When you do squats you do 5 reps and you can do them pretty fast and be done. If you do BSSs, you do 8-10 reps and the effort is pretty high for a longer time. You need to put in effort to counter potential body rotations, losing balance, controlling the descent, holding the dumbbells in your hands which gets tiring quickly when using 30kg+ dumbbells also plays an important role.