No vacuum cleaner is perfect. Almost every vacuum cleaner has design flaws that create problems. Maybe the biggest problem is that, as the filter bag fills with dirt, there is less airflow and suction. This problem is even shown in bagless vacuums because the filters clog up as the container fills with dirt, dust, and pet hair.
The worst feature that most vacuum cleaners have that they have bags that eventually clog up and restrict air flow. All bags and filters are porous. All bags, cloth or paper, have tiny air holes that allow the air to flow through them. When there is a dirt particle larger than the air hole, the particle clogs the hoe and restricts the free flowing of air. Event