What he's saying is that if you want a tracker mortgage they you should get a tracker mortgage and not gamble on a fixed rate mortgage being cheaper. (I think)
He also (somewhere up there) agreed that my getting a fixed rate and then converting to a standard variable rate because that met my needs at the various times was the right thing for me.
So the whole arguement seems like a tautology to me - the fact being that if you know what you want you should buy that and not buy some other different product that _might_ work out cheaper.
IMO, someone with a small mortgage relative to income and with significant disposable income after necessary mortgage payments will probably do better with a flexible mortgage (that, to the best of my knowledge will preclude a fixed rate deal) while someone who is stretching themselves - especially first time buyers who might have significant other expenses early on (e.g. furniture) or who might have to dig deep into savings in order to put the deposit together so lack much flexibility to react to changes in circumstances or interest rates will probably prefer the security of a fixed rate deal early on.
Of course, people who fix their mortgage for a short term at a historically low rate without any plans to deal with probably higher interest rates a few years down the line when their fixed rate runs out are gambling, exactly the same as people who are stretched to the hilt taking out a variable rate mortgage when the interest rate is at a historic low. The fixed rate ostriches can just ignore the problem for longer ;-)
Tim.