For one developer to create and update all tracks and create additional tracks is a lot of work. Yea the quality is top notch, but even these tracks get old eventually and LFS physics are just too good to not be experienced on custom tracks.
Yes we have a layout editor with concrete blocks, but those are very dull and boring looking, almost textureless and looks like lego blocks. Some people have created impressive layouts using concrete blocks, but visually it's very primitive looking, not to mention bumpy and slippery concrete slabs.
It works for the most part but i just wish we had more objects to play with, bigger limit, scenery objects like trees to place so the layout doesn't look so plain and empty. Chalk, bigger chalk lines? Those eat a lot of objects because of how short they are.
Sometimes i feel creative so i load up LFS, but then i get unmotivated pretty fast because i just can't build the layout i want.
Can't even do rally cross layouts because there is no surface to support that.
I think even some sort of primitive level building tool would be enough for a start. Like building inside the 4x4km area of LA but ability to actually place roads, buildings, trees, etc.
As an artist and creator i'd love to create something special for LFS.