I think there is a technical reason why Cubase has a limited number of inserts. I reckon each complete track gets a thread, if you were to add more inserts the liklihood of running an individual CPU core into the red increases. The stutters clicks and CPU overloads Cubase owners know and “love” will only get worse. Other DAWs seem to multithread much more intelligently, Cubase probably needs a huge part of its core ('scuse the pun) engine rewritten to remove the heavy thread bottleneck which seems to haunt Cubase.
That said the current 8.5 patch has sorted out many of my CPU issues - to a degree - I still find Mixbus and Reaper to be far more CPU efficient running exactly the same VSTs. I simply do not have to worry about project sizes in those DAWs.