i think eaveryone should resign whenever they want: early or at checkmate.
if you cant quickly mate someone with ease then your win can't be very convincing.
That said i still understand david tebb wanting early resignation once he has won - even before he has won you have little hope, once he has an advantage the average player can recognise, then you have zero hope. resigning early means he can play the part that has interest for him, instead of going over and over the same old techniques.