Use Cases and Deployment Scope
I and some others on my team use Scratchpad as a more convenient and quick way of interacting with our opportunities from Salesforce. I found that Salesforce lightning is actually very slow, and it seems that using Scratchpad is actually a much faster process. It's also a lot easier to customize and modify my reports, due to Scratchpad's interface just being so much more user-friendly.
Alternatives Considered
Salesforce Lightning Platform (formerly Salesforce App Cloud)