There are two ends here, as a user and as a developer. As a user Docker images just work, so you solve almost every problem you’re having which would be your users having them and giving up on using your software.

Then as a developer docker can get complicated, because you need to build a “system” from scratch to run your program. If you’re using an unstable 3d party package or missing packages it means that those problems would be happening in the deploy servers instead of your local machines, and each server would have its own set of problems due to which packages they didn’t have or had the wrong version, and in fixing that for your service you might be breaking other service already running there.