I saw this thread of Reddit and I have to admit that I agree with OP 100%.

Speaking of Guildhests - Lord of the Rings Online was one of the first MMOs to implement a feature like Guildhests; they were called scenarios. You could do them in 10 minutes and they gave you rewards that could be traded in for gear and you received experience on a number of factors, one of them being speed and efficiency. There was also a daily XP bonus. It worked out really well. It felt like it was worth my time to run them. If Guildhests had a 'first time completion' bonus and then a separate 'daily completion' bonus we would be in business.
If you have more incentive to run instanced content, and run them more than once, that means you have more tanks and healers wanting to run them, meaning you would have less queue times too.