Neonchameleon
Legend
Because it doesn't broaden the appeal. It changes it, taking the warlock away from people that basically like the mechanics as is and leaving them with nothing while appealing more to people who already have multiple classes that appeal to themAnd, you know what? What's wrong with broadening the appeal so that more people can become fans?
Why do you consider there is no cost to taking away the class from the people that like it the way it is?Even if this wasn't the way to do it, what exactly is wrong with trying to attract more people to the class? You speak as if this is a bad thing to do.
I wouldn't consider this such an egregiously horrible move if it had happened to one of the standard full casters. Change the druid's casting and people who like those mechanics still have cleric and possibly wizard and sorcerer. Change the warlock's unique casting, that has quite a lot of fans and the people that like it get absolutely nothing.
Why shouldn;t different classes work differently? Why do you consider them all working in a homogenised group that please the same small group of people to be an improvement? What you are advocating for is driving people away from D&D. Because some of the parts that appealed no longer exist.