Companies spend a lot of time building change sets. Here are some of the limitations of change sets that you should know:

Change sets do not offer the capability to search components by name or type. As a developer, you are forced to browse through multiple pages to find the metadata items you want to select.
If you accidentally add a component, you cannot filter within your selections to remove the component quickly.
Certain components are not available to be deployed using change sets, and it’s possible to move changes only across connected environments.
With change sets, all selected components come in a single list, so you can’t scope which modification is based on which request.
Change sets do not enable continuous delivery, and automation of deployments is not an easy task.

Change Sets Limitations for Deployment in Salesforce