Clears throught... Many of things but to be specific: Certain java features to be added in bedrock that wouldnt affect performance too much or would increase performance, Bedrock having an enemy spawnrate command/slider so you can mine in easy+ mode without being jumped, Tone down most songs since they are really loud and obnoxious, and THE ADD THE BEST FEATURE YET! innnnhalllee.... exxxhhaaaaleeee...... its the offhand thing, everything should go in the offhand not just a select few.
For bigger ones...