I think Siemens deserves to be on the list but your main point remains. They all really excel at one step or another in the EDA chain. Even they do compete generally across the all broad scopes it sometimes feels like it is not a serious effort. Sometime I wonder which is cause and which is effect, is the reason some fabs simply don't provide PDK support for all options with each company because the tools are lacking or are the tools lacking because the fab does not want to provide support.