One of the characteristics of TC is the strict separation of base, local static data, dynamic data.
This provides for a maximum of flexibility and portability and simplicity of administration.
For many years I hat tried to achieve similar in various ways with various distros in hackish ways for my own purposes, more or less successfully. TC is providing such out of the box, and despite explicitly stating not to be a keyturn system, to me wrt to this very aspect in fact it is keyturn more or less.
Integrating the dynamical data which is now located in /opt into /tce would be a first step away from this principal structure which I am not sure where it could lead to.
Also this would mean that in cloud mode local customized boot scripts and configuration files would be placed in /tmp, which I don't think is the greatest of all ideas.