Vista,
The dynamic nature of our industry and in turn our job requires flexibility. We have always and will always continue to be required to change our day at a moments notice because of factors out of our control; including aircraft going tech, diversions, and cancellations of flights. I know I have ended up in a different port because my duty has been changed due to one of these circumstances, I have even had my day cut short on a couple of occasions. That is just part of my job!!
Could you imagine the chaos if there was no flexibility- it would take weeks to get schedules back on time due to fog in MEL.
If this is something you are not happy with perhaps you need to reassess if this industry is for you. I can assure you that this is one condition that will NEVER EVER be taken out of the EBA. No matter how many times we vote 'no'.