I’m not sure I would support the use of any countback method at all really. There are many different ways to play cricket successfully, the fact you have a tie in the first place proves that. My preference would always be a super over tie break and following that the head to head result.Make it least wides bowled then or something. Whatever it is, it's a sucky way to lose such an important game but barring having a second super over, it probably doesn't matter what that countback method is. You're deciding that one teams just needs to tie it and the other needs to win by a run. Both teams know where they stand before it happens.
I’m not sure I would support the use of any countback method at all really. There are many different ways to play cricket successfully, the fact you have a tie in the first place proves that. My preference would always be a super over tie break and following that the head to head result.
BH, I really think the ICC or whoever will look at the situation you have outlined where a countback system will probably always result in one team having to score more runs than the other to win, while the other just needs to equal the first. It is intrinsically unfair imo.
If both the primary reserve days of a semi or final are washed out then who finished higher on the table would be reasonable I think.