One of the noisy limitations on Dynamics 365 Business Central until version 17.X was the impossibility to extend standard reports. If you want to add a simple new field to a standard report, you are forced to create an entire new report (new dataset), maybe from scratch or (better) by manually copying the standard dataset into a new .al file and then modifying it. You cannot handle the report dataset as an “extendible” object open for contributions between extensions.