Things you mention (like reactions) don’t come from engine limitation - it comes from Larian believing that such system wouldn’t work well in computer game and is looking for other solutions. I wouldn’t expect reaction to be implemented as they are in PnP at this point, though it’s been mentioned that they are looking on some kind of change/improvement of the current system.
It’s been also confirmed that engine have been heavily overhauled for BG3 - they are not limited by what D:OS2 allowed, and that should be obvious just by comparing both titles.
Well they said they were working on implementing it but I didn't get any details. I am super curious how they are going to make it work without creating a mess and issues with combat flow.
I don't think pausing the game while someone determines reaction is viable - but maybe setting reaction conditions? "If Crit - then Smite" or just "If Hit then Smite" would work I think.
Also do Reactions cover Ready Actions? Solasta lets you only Ready Cantrips but RAW can you Ready more powerful spells?
