Seems like it makes sense to me. Here's an analogous situation to jquery:
X = a huge workshop with a million tools, a table saw, ladders, and yes, a hammer and some nails
Y = some nails
Z = a hammer
You need to hammer stuff as part of your job. Yeah, if you get rid of X you need to replace it with Y and Z, but it still seems like simplifying to me, if you're replacing a whole room full of tools with just the tools you actually need.
X = a huge workshop with a million tools, a table saw, ladders, and yes, a hammer and some nails
Y = some nails
Z = a hammer
You need to hammer stuff as part of your job. Yeah, if you get rid of X you need to replace it with Y and Z, but it still seems like simplifying to me, if you're replacing a whole room full of tools with just the tools you actually need.