Take Lane has slivers if first take longer than second. Is this by design? [Yes, kind of]

That's what Comping mode does by design. The mode was introduced in X3, and that's why the clips in the videos (captured in X2) aren't split.

jpetersen
You miss my point.
 
If the second recorded clip is shorter than the first, the clips are split without any action from the user.
If the second recorded clip is longer than the first, the clips are NOT split.

 
Which recording mode do you use? Comping mode? Overwrite mode? Or Sound on Sound mode?
 

Comping mode. I thought you first record, then comp. But I get it now.

Yes. It is making the assumption that the new take will want to be heard (like an overdub) and then next (audible) priority goes to the previous take or whatever you had previously "promoted". The split is (in the comping scheme) necessary to allow this to happen.
 
However... it can be a bit of a fart around when you record like I do... which is manually engaging transport for each pass instead of setting up predefined stop/start "Punch" points. I end up with a bunch of enevenly ended clips and "slivers". I correct this by select all the clips in the track (or in that section), setting the Now Time to some point before the end of the shortest clip, hitting S to split all the clips then lassoing everything after and hitting "Delete".
 
Now all the clip ends are even and all slivers are gone. Doesn't matter if there is useable audio after the split point (like if I hold a note or something) because then I can just slip edit all the clips out simultaneously to expose that type of thing (and the clips without any data after a certain point will still slip edit out with the rest... there just won't be any signal at the end).
 
There does seem to be some weird hoodoo that goes on where some clips won't group together if I close the project and return or record something else in another area and return. That makes sense but it's a bit of a pain if I want all those clips to be edited in unison... but I could just create an entirely new group if it becomes a major problem. Usually I've done my comp and flattened well before that point though.
 
It's an odd system and is a little quirky to figure out but all in all still better (IMO) than the old methods.

It confused the heck out of me the first time I used the feature.  I still can see no benefit to splitting all of the other takes if I stop the current take early, for example.
 
But as someone mentioned, I just lasso the fragments and slip edit the original takes that got split.  The original audio is still there, in both parts of the split takes actually.
 
Most often I'm just recording my own vocals.  I loop a verse or a chorus until I think I've got some keepers.  And to avoid a real mess I record those sections in separate tracks.  Then I clone those raw vocal tracks and go through the takes in the cloned tracks for each section. It's more work I guess, but it helps me stay organized and all of the raw vocals are preserved, just in case.