Because in 3 years time when you sell it you will have a substantial deposit for a new car. Sure, it works better depending on your current financial position but I suggest if you are looking for buying a house then renting a Tiguan for £450 a month is out of the question as well.
But you'd have paid £538/m on a 5 year loan.
Forgetting the issue of how £538 is more than £430....
Over 3 years your payments would equal : £19368
A 3 year old Tiguan value from Parkers ~£16,000. And at 36 months you'll still have £13754 of the principal of the loan remaining.
So about £2500 equity. EASILY swallowed up by insurance tax tires servicing for 3 years.
Where's the gain again?
A bank loan for the full amount isn't the solution either.
If the OP had a deposit to pay, or got a ridiculous bank deal, great. What he has done is a good way to get the car he wants. IMO. And I would do the same if I wanted it.
On the note of me looking for a house, in my case I live with my parents atm, my outgoings are minimal. My remaining income covers my prospective mortgage payments (+bills) easily. But surely having a £26,000 loan on your head has an effect? (Im not sure on these things...) Even though I could afford goign the bank loan route, I'm still uneasy about a larger amount of my monthly pay going out for the prospect of what will happen in 3 years. I'm the kind of person to pay a deposit, I'd never finance >60% of a vehicle.
Edit - Just saw your post Sigma, and I understand what you mean, but even if the residual value was £18,000 (which I highly doubt as by that point a facelift or new model may be out or around the corner, damaging the value of the used car), thats about £4,500 equity, for me take £2,000 for insurance for 3 years (assuming it reduces as I get older), and £2,500 less tires tax servicing. Doesn't leave much right? All for the fun of paying >£538 per month to run a Tiguan.