With a bigger jet, the momentum (product of size{mass} and speed{velocity}) is higher and so is the inertia. So it'll be harder to stop a bigger jet compared to a comparatively smaller one. So heavier and bulkier the jet, the harder it is to decelerate.
Another fact is that jet engines cannot be played around with like a small piston aircraft. It takes more time for the power to spool up.
And pilots perform and a go around whenever they feel its necessary.
KJ