I would keep them patched tbh
The last patch notes were:
Patch 1.10 release notes
Features
Legend system:
New skill tree unlocked after maxing one of the base skill trees
Nightmare difficulty level
Bounties system
New weapons: firearms, melee, crossbow
New parkour moves animations added
Improved human enemy AI
Improved Volatile AI
New NPC models
Enhanced facial expressions
Post process effect customization - sepia, black&white, poster + other effects
Audio upgrades
Valve Anti Cheat support added
Select community created maps added into the game
DrinkForDLC content:
New quest in Old Town
Water balloon item for more powerful electricity effect on zombies
Two new water challenges
Support for Dying Light: The Following Expansion Pack
Fixes
Various stability improvements, including co-op
Various balance tweaks: player development, economy and weapons / crafting balance
Improved fighting against human enemies and virals