Including madid (Mobile Advertiser ID) in Conversions API Request from our server improve the precision of CVR or will have no impact?

The documentation says "Note: This parameter is for app events only" for madid. https://developers.facebook.com/docs/marketing-api/conversions-api/parameters/customer-information-parameters#madid

But I'm sending the event for subscription renewal which is observed by our server through a notification from Apple. We could potentially save madid from the client app to our server and send it with event request, which seemingly improve the precision of CVR as facebook can match a conversioned user among ads audience by using madid rather than email / personal info which is not one-to-one. e.g.) they cannot find a match of the user if the user uses different emails for ads distributor and our app.