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What Spotlight already covers
Apple's Mac Help describes search for apps and files, calculations, unit and currency conversions, dictionary definitions, quick actions, and clipboard history. Clipboard retention in Spotlight settings is 30 minutes, 8 hours, or 7 days. Command-Space is a documented way to open it. With Siri AI turned on, Apple says you can ask Siri from Spotlight. That feature is marked beta and depends on Apple's requirements.
What you would be adding
Raycast's Free examples go past that system search: a longer configurable clipboard history, snippets, Quicklinks, an extension store, window-management commands, and five notes. Paid plans add the AI credit system, Cloud Sync, dictation, translation, and custom window layouts. None of that is required to find a file on a Mac.
They are not fully separate on a Mac
Raycast File Search has its own local name index. If you enable Content Search, the manual says it uses Spotlight's index and stays disabled when Spotlight does not cover the folder. Excluding a folder from Spotlight can therefore limit Raycast as well. Installing Raycast is not a reason to turn Spotlight off.
Clipboard history is an easy place to get confused
Both can show earlier copies. Spotlight's documented maximum window is 7 days. Raycast lets you pick from one day up to three months on the options that are not marked Pro, and longer only on Pro. Raycast's history is not synced. If you only need the last afternoon of copies, Spotlight's setting may be enough.
Windows and shortcuts
Spotlight does not answer a Windows question. Raycast's Windows app does, with the parity warnings on the Windows guide. On a Mac, both tools may want a comfortable shortcut. Apple documents Command-Space for Spotlight. This site does not publish a default Raycast hotkey. You will have to assign one that you can live with.
A reasonable split
Use Spotlight alone when search, quick math, and short clipboard history are the whole job. Add Raycast when you want snippets, a store, window commands, or the paid AI features, knowing you are maintaining a second app and, for AI, a subscription. That is a preference. It is not a defect in Spotlight.