@OmarAlmonte - Millions of XML-RPC API calls are being performed every month. All the necessary data is present within your own system. You would be able to see what types of querying that is being performed with XML-RPC.
Here are examples of other gaps.
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REST Improvements - REST v2 - Improvements Request - Examples given in there, but repeated here.
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Wildcard querying - https://integ
ration.keap.com/t/wildcard-filtering-in-rest-v2/93418 - This can be achieved with the XML-RPC and is useful when you are trying to find partial text. -
Product SKU querying - Can I retrieve a product by SKU when using the PHP SDK? - #3 by OmarAlmonte
There will be several others that have been requested over the years within this community and support tickets.