It's great that the easy pattern-along-path functionality is already being implemented!
Now is it possible to implement a view mode that turns all the LPE effects off and only show skeletons?
The reasoning is the same as with outline mode: rendering speed. Some complex shapes may be quite complicated and take a long time to re-render every time, especially if one is only seeking to edit the skeleton. In fact, skeleton-only could be an option of outline mode.
The biggest conflict is with Spiro lines, since users treat those as "normal" lines and not LPEs, thus probably don't want them to suddenly disappear. I'm not sure what can be done about this, save either making an exception for it (preference option?), or eventually implementing "native" Spiro splines despite them not being part of the native svg specifications.