1. Stronger enemies
2. Limited resources
3. Perma death
4. Ironman mode
5. No respec
6. debuff on over-longrest
7. more timed requests
8. less exp
9. ....
All are welcome but none will satisfy everyone. Larian please just build a difficulty slider and add in all those options. They are for more experienced players anyway so those who're fine with the current difficulty can still have fun with the current setup.