More people tour on everyday, hybrid bikes than do so on specialist "touring bikes". People have ridden hybrids just about everywhere you can ride a bike. The wider tyres >35mm are good for off road trails and you can slim down if you are mostly riding well surfaced tarmac.
The chainstay length of FX is 44.5cm compared to 45 for the touring Trek 520. It is plenty long enough to handle a load well.
Hybrids lack a selection of handholds so you can add bar ends or aerobars or replace the flat bars with trekking style butterfly bars.
Modifying a hybrid to take drop bars not worthwhile.