The reason why early game is so hard: enemies have mostly stats and skills on an optimum level. You as a player are lacking good equipment and enough skills, instead of facing equally 'badly equipped' enemies you are fighting uphill. Later on your equipment is more fitting and you have more skills at your disposal. Many of the mechanics are kind of broken in prinicipal like teleport and invisibility so you as a player get a huge advantage against the AI from them.
-- Inability to use Fast Travel from just any place in the map. Fast travel can only be performed from shrine to shrine; Or at the very least, make it impossible to fast travel out of dungeons, caves, etc. That's what the teleport pyramids are for!
How would that enrich the gameplay? It would make the game just more tedious and boring. Out of the same reason durability got removed as Stabbey already mentioned. Even if only for honour mode I don't see how it would make the game more challenging.
Also this game is riddled with possible cheesy tactics, there are so many ways to abuse AI or general mechanics, there is no way to fix them all anyway:
- drowning enemies in dozens of explosives barrels before blowing them up
- keeping the boss talking while the rest of the team slaughters his henchman
- going invisible in general
- fleeing combat and returning to get a new turn
- killend 1-2 enemies, fleeing, engaging again, killing 1-2 enemies, fleeing, rince and repeat
- filling a indestructible chest with tons of garbage and throw the chest on the enemies
- and probably many more
If someone want to cheese or save scum, he should be able to do so, in the end he is only cheating himself.