Yes, You are correct. When people do not know how/why things work, they are less likely to continue. I have done the same many times.
Flower essences and Emotional essences are vibrational remedies. This means that they work on the body, emotions, and spirit. It is not just physical like a vitamin or herb.
Essences are such tiny particles, that makes them extremely potent. They are able to enhance your vibration to higher vibration at the core level of your being.
Its not an abrupt change because the body Does Not make permanant changes in an abrupt manner. Gradually you may start remembering or dealing with some problems you have or just "let go" completely of some ill feelings you had.