Yeah often times fonts can have pretty messy curve structures, things like many small segment fragments, slight kinks in between pieces instead of being tangent, stuff like that.

Those kinds of things don't particularly have an effect on making a 2D filled outline (which is what they are originally created for) but can be not so good for treating them as 3D geometry. So a rebuild step could be a good idea.

But Times New Roman itself seems to be pretty cleanly constructed though, so it's possibly one case where it may not be necessary.

- Michael