Facebook Server Side + Salesforce Commerce Cloud - best practices

Question

Looking for feedback from anyone that has implemented server-side FB pixel on SFCC since iOS 14.6

this is a big lengthy so I do apologize, but I haven't seen this issue referenced on Stack and I'm imagining the use-case is growing as companies keep migrating to SFCC.

I currently have server-side enabled out-of-the-box on SFCC for the Facebook Pixel. While it fires appropriately, I'm still seeing a handful of errors as noted below. This was a necessary step after 14.6 decimated our existing FB pixel and it has worked, for the most part, but I can't help but feel as though there's something is fundamentally broken about it.

Errors keeping me up at night:

• Am I correct in ONLY using the server-side FB pixel and having the third party tracking pixel turned off?

• Should I even be using the SFCC out-of-the-box server-side set-up?? Am I better off building the connector out myself via GA4?

• "Server External ID Not Matching to Pixel External ID for Purchase Event"

• ^ this makes sense as I ONLY have the server-side running and no web pixel, but unsure why the issue is still presenting itself on the diagnostics tab.

• "Server Sending Invalid Match Key Parameters for AddToCart Event"

• ^ FB support mentioned that this is because a parameter is missing from AddToCart, which i'm guessing is the $ total, which SFCC isn't sending OOTB.

• I'm getting a bunch of external URLs in the "Recent Activities" section for the "Purchase" event, but not on the pageview or any other events. unsure what the impact is here.

• The "Aggregated Event Measurement" tool shows "No Recent Activity", and FB support was not very clear on why or how this happens.