We have a client who already uses GA4 to capture web events, which will fulfil most of our Data Cloud use cases. If GA4 is already in situ, then how much value is there in deploying and configuring the Salesforce Interactions SDK?
The only big benefit I am aware of is that we could bring interactions straight into Data Cloud in real-time, whereas GA4, where there is not direct integration, would need to integrate via AWS/Azure storage, or SFMC.