Why is everyone assuming 076 will have emcats? Or did I miss the memo?
Because the original rumours and info dump for 076 years ago was basically "this would be a CATOBAR LHD with EM catapults".
The current base of knowledge underlying "why is everyone assuming 076 will have emcats" is the same reason as why everyone "assumed" 003 would be a CATOBAR aircraft carrier.
I summarised everything at the time, as below