I am honestly curious about this - given the difficulty Larian has had in implementing core changes - would it have been easier if they had built a new Engine from scratch instead of modifying the existing Divinity Engine to handle 5E. Larian instituted a ton of changes in Patch 5* - which caused a cascade of new bugs to crop up that will need to be fixed over time.
They still need to implement the "Ready Action" and/or "Reaction" system (A little confused on whether Reaction system also encompasses "Ready actions").
When the Reaction system gets implemented - if it can be implemented - what will that break? Are we nearing the theoretical limits of how much the Divinity Engine can be modified?
Its a 9 year old engine at this point if I am not mistaken.
*Incredible, amazing, much-needed, happy changes.