Oh, I've been thinking about doing just this as well, at some point. So I'll happily join the effort !
Note 1 : I'm currently in a working/forum visit mode that means I visit somewhat frequently but don't have hours to spare. So I'll just jot down things, mostly from memory. I will correct and complement things later. Basically, this post will get edited.
Note 2 : as Tuco suggested, this is a list of the changes that we consider to be
meaningful. Everyone cares about different things, but the goal is still to aim for the main things. (In a way, this is also a way to see what the players did and do care about.)
Note 3 : I'm personally interested in keeping track of which change came with which Patch. Ideally this is listed in the Patch notes but, on the one hand, I don't have all the time I wish I had right now so I won't go and flip through the patch notes and, on the other hand, I know that not everything was documented in the patch notes. So my list will be sorted (primarily ?) by Patch.
Patch 3.- Movement and Party Controls : Follow-On-Jumps. The whole Group will follow on a jump.
Patch 4 (Druid).- (Can't remember or can't think of something right now.)
- Actions UI > Spell Upcasting : the upcasted versions of a spell no longer take an additional icon in the Hotbar.
Patch 5 (Systems).- Backstab rule : gone.
- High Ground rule : changed to +2 instead of granting Advantage.
- Disengage separated from Jump and costs an Action (I don't remember if this was properly listed in patch notes).
- Ability Check UI upgraded : it is now easier to cast buffs during conversations.
- Movement and Party Controls : hotkey to Group All/Ungroup All. (Undocumented.)
- (P5??) Actions UI : revised Hotbar.
Patch 6 (Sorcerer).- (P6??) Abilities such as Battle Master Maneuvers : now consumes your resources (Superiority Dice) only in case of a hit, as it should. (Undocumented.)
- (P6??) Movement and Party Controls : hotkey available for Jump. Previously it was only Hide. Other actions (such as Dash) still don't have them.
Patch 7 (Barbarian).- (Can't remember or can't think of something right now.)
Patch 8 (Bard+Gnome).- Spellbook UI > Spell Upcasting : upcasted versions of a Level N spell are no longer listed in the list of spells for Level N+1 and above.
- Combat AI and speed : Swarm AI.
- Rules > Class Abilities : Expertise added (for Rogues and Bards).
- Conversation UI : Detect Though can now be used during the conversation. We no longer need to pre-cast it (or ignore the spell altogether).
Edit : ok, strike out the part about memory. I've checked the Patch 8 Notes quickly. More edits to come.
