Currently i use the document understanding tools to extract invoice and ticket. However, i notice that the validation station will scan through and check for each invoices.
Validation Station is not mandatory ,but if the extraction is not 100 % accurate then you can use it.
It depends on the stability ,structure and format of the document and the extracted data accuracy to decide on.
You can as well use it and place a condition to check if the accuracy is greater than 80% or more skip the validation .
This will not open the station for all documents,and will pop up if accuracy is less than 80 % or based on your criteria.