WHY? Because JCL is too lazy to hire new programmers

No that's a matter of business, rentability.

3DGS is outdated in terms of interface and tools.
They need programmers indeed to redo all editors and make only one and a modern one.
And with Unity now being free , 3DGS feel very outdated also.
I like it, but i don't feel to spend money for the future commercial version of A8.
In Unity free version, even without shadows you can do lot of things if you use ligthmaps and some blob shadow for characters.

One way fo A7 (future A8) would be to make it open source like Ogre3D and perhaps with a special license to use it ?

Ogre 3D is very powerfull :
Ogre3D user project
It would need a all in one editor to compete with Unity easily.

I think A8 will remain an engine for programmers mainly , and programmers don't mind about workflow or a complete all in one editor !