In Alteryx Designer Version 2019.3:
Input Data has a feature to ignore/exclude the top rows by using "8. Start Data Import on Line".
Suggests that to add the similar kind of feature to ignore/exclude the last rows (when we do not know the last row number of each file).
It could be beneficial in many cases when we import system generated *.CSV and *.xls/x files.
Below is a scenario when we get extra lines in the end: