Yes, generally, faster results are better, though there are caveats even there. The question is what the relevant tradeoffs are. For many, there are actually none. ZP works pretty fast for most of us.
But there are superficial and deep changes, ad hoc changes and organic changes. If a guy wants to have more muscles in the pictures for a dating app, there are two effective ways to do so. Photoshop and working out. Photoshop works much, much faster. It also has the problem that the image can break fast, like on the first date fast.
There is a classic approach to creating subliminal based on making a list of commands and making the person listen to the commands over and over for hours, day in and day out. Clearly, this is not what SC does. Not having any knowledge of what their method is, there are two possible explanations: Either they managed to cram hundreds of pages of commands into a few minutes, or they leverage the powerful machine behind our ears to come up with them ourselves. This makes the effects more varied- we are all different after all, more subtle- we don’t magically change our behavior radically, and it makes the changes more permanent- they are part of our natural process of maturing and growing.
Many of us have a life we by and large like. We have friends, family, partners, colleagues we treasure and who treasure us. Becoming a new, radically different person is not the best option. If you want to be attractive, you could listen to suggestions that make you attractive in the eyes of many generic people. But they may not be what makes an existing partner love you. Organic change is better for those who have a life in which they want to grow instead of going back to square one and starting anew.
Sorry for the rambling, but these are things I wanted to get off my chest for some time.