from structure pov, i don't need to have a beam underneath to take a load, brickwall are heavy. less load mean reduction in beam and bar sizes which ultimately affects foundation works. this gypsum wall is light and allow to adjust room size without the need to redesign the whole structure. as gypsum wall is not a permanent structure, it can be used to skirt lighting, ventilation requirements of a room.

skim coat used for smooth wall finishing looks good, but for me, it is a cosmetic effect to mask poor plastering skills.