I know this is an ancient topic - but just to make sure other people might
find this when they google or search. This seems like it's the exact Maya
function to just "collapse" the .pnts data into the vertex positions:
https://help.autodesk.com/cloudhelp/2018/ENU/Maya-Tech-Docs/CommandsPython/polyCollapseTweaks.html
*This Maya function will "bake in" or "collapse" the Vertex tweaks of a
Mesh into the vertex positions. It basically clears the .pnts attribute
whilst preserving your output. It's super fast too.*
Be aware that it seems to error out when there's no tweaks on the mesh yet.
However, that's not an issue since you can also query it instantly with
this method:
for mesh in meshes:
if cmds.polyCollapseTweaks(mesh, query=True, hasVertexTweaks=True):
cmds.polyCollapseTweaks(mesh)
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