The biggest differences with bg3 combat is: - Surfaces - Shove/Push Actions - Elevation Advantages - Jump/Disengage to gain Advantage from a flank
you forgot "healing food" issue
The food healing issue isn't as game breaking in my opinion. Food takes a bonus action, much like a potion. Even then the food does not scale with your level and is maybe 1-10 hp in recovery. At higher levels this will be insufficient in combat. The mass availability of it trivializes short rest/long rest though. Possibly put a debuff on food so you can only eat so much in a day before needing to rest? Or make it mandatory to have food in order to short rest and provide more short rests allowed in a day.