Evokers in mc bedrock are weaker than they're in java and console edition,they rarely start with vex summoning attack and they take a long time to perform it,and they can be beaten by any mob such as zombie,in addition that they use fangs attack a lot more than vex summoning,and also vexes are broken too,they move so slow and take a lot of minutes to become aggressive again and they don't swoop at players and other mobs.

So evokers need to be improved and behave like they are in java and console edition.