Well, I double checked the new Expression node and this node, which is the first in the line to replace the old expression based nodes, actually supports both “Row index” and “Row Number”.
That made me think why not having the same in all other nodes.
Thanks to your feedback and perseverance in proving your point 
, now we have 2 new tickets + 1 existing ticket to address the issues you have mentioned here:
- Existing ticket UIEXT-2094 for min value in the input fileds like for Row number in Row Fliter
- New ticket UIEXT-2172 to have further discussion to add “Row index” to the new dilaogs where there is a “Row number”
- New ticket AP-23342 to provide the Row ID, number and index options with the column list in the Expression nodes’ dialogs (which are already supported and mentioned in the nodes’ description)