You really don't understand how these things work. Small people taking some borderline cosmetic issue and declaring that it breaks the game as a means of self glorification. Just be glad that it was Rome, and not some OPM in the Hindu Kush.
You read way too much psychology into it. There's a word for attacking the people making an argument rather than addressing and debating the subject itself, but I'll respect you enough to assume you know you're engaging in a fallacy.
For me, the point is that they were making the most visible face of the Roman republic simply wrong. Same if they implemented a Prime Minister of the U.S. in HoI4 just because most other governments had PMs and it saved work to copy and paste. But it also goes beyond the diarchy because, as many have noted, the Republic was far more than a Senate and two heads - it shows on PDS's part a willingness to improve in that direction, and now I have far less doubt that every important historical office will show up in later patches and DLCs. It also suggests (doesn't prove, but suggests) that they want to take the game in a more historical, less homogenous, less sandboxy direction. Between all of that, I'm sold.
