Tom, a tent is an easy shelter to pitch, its better than a tarp in that it keeps the wind out, the water out, its warmer, no need to go lighting fires, lets you dry your clothes out, eat food in relative comfort, more sociable if sharing.
A tent for someone relatively new to camping (and solo camping for sure) is a perfect solution, take the tarp as well on a few trips and try different set ups but they should always have the safety and comfort of a tent to fall back on as their skill base grows I'd have thought?