Windows 10 and Windows 7 aren’t really all that different under the hood. Besides the UI, there are of course critical kernel-level differences between the former and the latter, but the rule of thumb that matters to end users is that if something runs on Windows 7, it will most likely run on Windows 10 as well. However, there do exist a few outliers that won’t work on Win10, and I suspect that’s why you want to downgrade.
If you find that some programs aren’t running well (or at all) on Windows 10 but are fine on Windows 7, you could try the following things before going through with the downgrade:
Getting the latest versions of your problem applications; the newest versions may be Win10-compatible
Running the problem applications in compatibility mode
Using alternative applications
To specifically answer the question, I don’t think it’s worth it to downgrade unless you really need some program(s) to work, and there is no viable alternative. It isn’t worth it mainly because official mainstream support for Windows 7 ended in January 2015.
What this means is that you will not be able to contact Microsoft for technical support regarding Windows 7, and you won’t receive any new non-security updates for Windows 7 because they aren’t making them anymore.