Interesting idea, but the absence of home/away distinctions could be seen to cause issues
agree, read the arguments and they don't hold any water.
1. Winning a series means getting a draw in the next is easier
2. Home and Away balances out
3. The most recent series away should cancel out a previous home series
4. More at stake when a series isn't back to back, like the 2013 Ashes
5. Long Intervals between series shouldn't count
Sounds like he has a system that he either can't be arsed to tweak or loves it so much that he thought up some pointless counter arguments to justify it.
Playing in Asia is totalling different for England as it is for India playing in Australia. An overseas win to a major feat, but somebody like SA have actually struggled to win at home. Poor home form and excellent away form need to be reflected. England lost to Pakistan 3-0 in the UAE but won at home 3-1, I make that 4-3 to Pakistan overall in tests but series home and away is 1-1, that's a draw not a loss.