Why (not) put a resistor on FET gate?
The gate source is essentially a capacitor. So with this high resistor, it would take a very long time to charge. The MOSFET will only turn on when the gate capacitor is charged above some level (the threshold voltage), so you will have very slow switching.

The reason gate drivers are often used is because they are able to quickly charge the gate capacitor (often using current above 1A) so switching times can be minimized.

You can read more here.