I doubt we know each other. Unless you are working closely with MoF.

First of all, thanks for your effort in your reply. Much appreciated.

Of course we know they cannot know everything. No one does except quacks.

But at least you humbly demonstrated and stated the limitations of an interior designer.

So we begin by stating, what is an interior designer.

I malas, so I will just copy and paste from wiki:

"an interior designer is someone who plans, researches, coordinates, and manages such enhancement projects. Interior design is a multifaceted profession that includes conceptual development, space planning, site inspections, programming, research, communicating with the stakeholders of a project, construction management, and execution of the design"

Which is a fair definition for me right?

The house tiling / water proofing / major plumbing and toiletries / electrical wiring, including fans/lights/and aircond have ALL BEEN COMPLETED before the unit was handed over to the ID team for interior furnishing.
Mine is already a completed renovated house.
Hence, the interior designer did not need to handle the task that you have elaborated.

Really, the bare minimum I would ask of them is to install furnishings without further damage to my unit. But even that was too much to ask these days I guess.