If you are using cameras that are compatible with the UX-Tube Extension Tube, it is necessary. This product consists of a thick lens to achieve high performance. For this, it is heavier than general lenses from other brands. In order to support this heavy lens, UX-Tube Extension Tube is necessary.
There is a possibility of falling off or damaging near the lens if you use some kind of adhesive tape to fix the lens onto your compact camera. The lens tube on compact cameras are made very precisely, and they may be damaged by installing heavy lenses directly. UX-Tube Extension Tube was created to prevent those issues.