Hi and welcome to the forum!
Good question! The taxiway system has undergone a lot of revisions since we started development. The initial version from DevLog 8 that you referred to was very simple and not at all flexible. Each piece was placed as one large image and had little room for customization. You needed to align everything right to make it look good and could not extend the size of the taxiway. The new system is based on small tiles which adapt depending on how you build them. So you drag out taxiway according to your preference and the yellow lines align automatically.
We are aware that it does look a bit sharp and corny. We will look into how we can make it look smoother.