Hello all, new poster, lurker for over a year 2 years.
I agree that the execution of the elevator is questionable, but perhaps the justification here is that the lift and lock arrangement is at the rear of the model, where it won't be seen if it's simply placed on display. The gap is unsightly, but directly lifting the elevator with a "handle" may help to avoid having the elevator platform bind up in the shaft (if it were raised by a string/winch, for example). Plus, it seems to make it easier to have the elevator stay attached to whatever floor it's at. An elevator car dangling at the end of a string from the top floor would be fiddly to deal with when re-stacking the floors.
In any case, I definitely like the use of an elevator in principle. I'm now planning on modding my already heavily-modded GG to incorporate an elevator in the current staircase space. The GG is a perfect candidate for an elevator because it has a fire escape. Staircases look strange when the steps are over 2 plates high and the GG uses full-brick high stairs as well as the prefab staircase parts which are just unsightly. That, and the sharp turn near the top of the staircase on the ground floor just looks awkward. Elevators and their shafts are just a better use of space and I'm looking forward to making the changes to my GG soon (and I will probably use a string and winch at the top). Not sure why I never thought of it before!