I didn't explain it well but why would you sit on a 25 or 35 year term if the repayment is only 11% of your income
Well you don't always know what's round the corner (many high earners such as pilots a year or so ago for example!) so having a lower minimum commitment is a great peace of mind.
Plus, with interest rates so low, the old adage about 'pay off your mortgage and you'll save thousands' doesn't really apply any more.
We could pay off 80% of our mortgage today, with savings, but we're getting more interest on savings than we would save by overpaying so it would cost us money.
Other people choose to put spare money into a pension, that attracts tax relief that far outweighs the interest they pay on their mortgage.
In short, lots of reasons not to rush to pay off a mortgage and to be honest, I find the obsession with getting rid of it on here a bit weird. Our mortgage is quite a small expense. We spend more on food, holidays and probably other things, and it doesn't cost us anything in interest so isn't a priority.