Emolunemts is a tough case to prove (and it is going to be even tougher in court), ergo it was not included. Likewise the case for obstruction of justice (as a salient stand alone item) from the Mueller Report.
The current set of allegations is clear cut. Mr Trump did indeed leverage WH meeting and military aid for investigations into the Bidens and 2016 election theories. And it is clear he did obstruct Congress in their mandated impeachment inquiry.
I'm not sure that emoluments would be hard to prove. It was a feature of controversy when he ascended to the Oval office.
Wasn't there some guy whos in charge of ethics that resigned over the lack of any enforcement with the president?
I think the american public knows a ripoff when they hear one. A ripoff's a ripoff no matter what the lawyers say. You may get the same results as the foreign arm twisting foul being called on the president currently but at least you could get public sentiment on your side.
This current effort plays like lawyer porn for most people I know. Another problem is you have to have an opposition that's not doing the same kinds of rip offs.
Time will tell if this democratic strategy will backfire and mobilize the presidents base for him. That would be another backfire in a string of em.