I don't agree.
When I bought this house I used up every penny of savings I had to put the deposit together. Also my mortgage(s) were over 3x salary so I knew there wasn't much leeway initially. So I chose a 5 year fixed rate knowing that that way I could definitely afford things.
I would probably have been better off getting a standard variable rate mortgage except that, in the first year, interest rates did go higher although never more than half a percent higher so I would probably have been fine.
When my term was up it reverted to the standard variable rate. I don't remember now whether the interest rate went up or down at that point (probably down). But by then my salary had increased and I no longer wanted to be tied into a fixed rate but instead wanted to be able to pay off the capital as quickly as possible. I did remortgage, because I wanted the convenience of an offset mortgage (actually the One account) rather than having to make extra payments every month depending on how much spare cash I had that month but I didn't need to.
Tim.