I comprehend exactly what you're saying and I respectfully disagree.
Let's go back to your definition:
So, let's take a manufacturing line example. Someone wants to order 100 units of FFXIV to be manufactured. This normally takes the manufacturing line five days to complete. However, a technician found an efficiency in his work and got the line setup faster - therefore reducing the delivery time to four days. This is the opposite of a delay - you're now ahead of schedule.
So, a healer who does 0 DPS would be "normal expectations". A healer who adds DPS would now bring the clear time ahead of expected schedule.
Now, if it were the opposite. You could manufacturer 100 units in four days but an error from the technician cause the production to increase to five days. This is a delay.
In terms of FFXIV, a delay would occur if the healer's let someone / everyone die due to ineptitude. That would be a delay.
The one common thread and the absolute baseline anyone should be looking at when thinking about clear times is the developer's expectation. Anything AHEAD of that time frame is a bonus to the party dynamic. A 0-DPS healer therefore cannot delay a clear time unless they are so inept they caused a wipe.
Unless anyone can debunk this logic, there really isn't a leg anyone can stand about "delays" as any "delay" outside of the developer's intention is a selfish expectation of the duty finder requirements.
I will also say this about people arguing about the amount of effort a healer needs to complete their role versus a tank or DPS. It is unfair but it's the design of the game too. Until S-E starts forcing min ilvl requirements that will forcibly increase healer requirements or design fights to be random and spiky, healer's will always have less to do versus the DPS or Tanks because there is no such thing as "too much DPS". That's just the nature of the beast, unfortunately.
Does it make healer's who jump around and do nothing "the correct method of play"? Yes, unfortunately it does because for all technical aspects, they are correct.
Do you want people to stop doing this? Stop belittling the other healers and start encouraging them to play better.