Depends on what you mean by “chemicals.”
If you are talking about remedies for cyano, etc, the temptation is a quick fix. Chemicals can produce a rapid response that gives us the result we want without knowing the underlying problems. I use them sparingly and only as a last ditch effort. With any problem in your tank, always figure out the underlying cause then come up with a solution. Oftentimes a problem will not be truly fixed with a bottle of chemicals. Totally agree with your statement above, adding chemicals can take more time to fix a problem created by the chemicals.
However dosing “chemicals” can be very helpful, if you can test for them.
What chemicals are you specifically referring to?