What are the disadvantages of using cassette air conditioners?

WHAT ARE THE DISADVANTAGES OF USING CASSETTE AIR CONDITIONERS? LIMITED INSTALLATION OPTIONS- YoU CANNOT INSTALL THESE AIR CONDITIONERS IN LARGE OFFICES OR WAREHOUSES BECAUSE THEN YOU WILL NEED MORE THAN ONE AC. EXPENSIVE INSTALLATION- AS you HAVE TO INSTALL THE INSIDE UNIT ON THE CEILING, THE INSTALLATION CAN BE QUITE EXPENSIVE. INCONVENIENT- THEY COMPRISE OF TWO UNITS. WHILE ONE IS INSTALLED ON THE CEILING, THE OTHER IS PUT OUTSIDE. THIS CAN BE INCONVENIENT IN LARGE BUILDINGS. SMALL SPACES: THE CASSETTE AIR CONDITIONERS ARE NOT FIT FOR COOLING SMALLER AND COMPACT SPACES. INAPPROPRIATE FOR MULTI-STOREY- THE CEILING OF MULTI-STOREY BUILDINGS MAY NOT HAVE ENOUGH SPACE FOR INSTALLING CASSETTE AC. HTTPS://WWW.LG.COM/IN/BUSINESS/SINGLE-SPLIT-ROUND-CASSETTE