What is the worst part about working in the MEP sector?

I can breifly describe The meaning of Worst part is " Bad Coordination between all Departments"  No Coordination means a  Nightmare for all.

simple "DELAY of execution"

If resources not provided on right time then always it's affect will be worst during1st fix i,e related to structural works.It applies to other2 phases of construction.

COORDINATION BETWEEN WORKS NEEDS CLEAR , INVENTOR  AND REALISTIC MIND

1.Inappropriate coordinated shop drawings which leads to misunderstanding among different department at site. Consultant must not accept shop drawing for the individual service. All the shop drawing shall be submitted along with coordination drawing of all the services after studying structural /architectural drawing.

2. Proper planning.

As My Experiences any activates in MEP are worst, to avoid any worst in the MEP you should follow up the followings:1.Safety Matters.2.Proper Design.3.Proper Plane.4.Delivered materials on time.5.Proper Installation on time (selection the right person in the right place).6.Follow up the all Activates.7.Handover the project without delay ASAP.
With follow-up of the above activates, you will be on the save side without any worst.

As my knowledge worst in MEP for me, drainage.
How much is it, it can made worst in total building, evan in structure.

With out MEP coordination unable to work IN BIM and also project team

Electrical low voltage netwok along with fir alarm system