@Kem T LastRowIndex is not a change, it's an addition
If LastRowIndex was truly seen by Xojo Inc as an addition and not a replacement, Ubound would not have been deprecated... That means Xojo inc would strongly prefer we not use it NOW, and it theoretically could disappear in any future release (well any after at least 1 year)...
While I realize that is not likely anytime soon, if one is writing code one expects to need to maintain for the long term, one has to take deprecations seriously... While not actually forcing the change NOW, deprecation is rather strong coercion to do so... Ignoring deprecations is sort like having an overdue loan from a loan shark! You never know when you will get a "Candygram"... Oh never mind, CandyGrams are from Land Sharks not Loan Sharks! ;) (to mix skits)
BTW using row terminology for arrays STILL really grates on me... it is IMO so obviously conceptually wrong for arrays!