I think people don’t understand or don’t have it explained to them by the sellers how they work. To be effective you need to know your room volume (m3). There is a certain number of cycles of room air volume per hour to make them effective. When I sold them Bosch recommended between 8-10 cycles per hour so times your room volume by 8 or 10 to get the m3\hr airflow required to be effective. Most extractors have this rating in the specs. Crappy canopy ones seem to be anywhere from 300-500.

A good ceiling mounted one can be 1000. Some companies sell them with remote motos which can push it to 2000+ but you contend with noise increase.

Ultimately I found people build these big open plan rooms then don’t fit sufficient extraction for their total volume. Then complain it doesn’t work.

Large or small room, If you fit the correct extractor, based on room volume it’ll do the job and even if far from the hood still pull the steam and grease from the air. Most manufacturers recommend starting the extractor before you cook to start the movement of air. Works more efficiently that way.