I should probably also note that, at least on my laptop, dragging things isn't the only activity adversely affected by this. Trying to hold down spinbox buttons, for example, causes them to continue to increase/decrease at a high rate until an extra tap is used to stop it, which is slower than just releasing the trackpad. So at least in the case of spinboxes, this change makes them much more difficult to use when trying to quickly spin up/down to a certain value, especially at times when the extra needed click occasionally doesn't register and you end up rocketing all the way to the maximum/minimum allowed value.
I should probably also note that, at least on my laptop, dragging things isn't the only activity adversely affected by this. Trying to hold down spinbox buttons, for example, causes them to continue to increase/decrease at a high rate until an extra tap is used to stop it, which is slower than just releasing the trackpad. So at least in the case of spinboxes, this change makes them much more difficult to use when trying to quickly spin up/down to a certain value, especially at times when the extra needed click occasionally doesn't register and you end up rocketing all the way to the maximum/minimum allowed value.