Brother Zmeselo,
I respect Eritreans and their disagreement with our current system of governance, but the truth is, it is the only way to keep the country together for now.
Many of us from the south, who lost a lot (that's putting it lightly) during the conquests of the previous emperors (who couldn't have done so without European elites), want a form of autonomy and our own state(s), and of course, this will be based on ethnicity/nationality.
No system of governance is free of problems or flaws, since the very minds that designed it are inherently flawed.
Remember, what works for you and others, may not necessarily work for us. It is all context based-which is similar to the answer an Eritrean sister/official gave when asked about Eritrea's style of governance.
(Sister Askalu Menkarios, around 16:39)
Tplf, with their ulterior motives, of course, exploited it, but we've always had these problems in Ethiopia.
We have a looooong way to go, on this journey, of re-defining what an Ethiopia is; not just someone who wears white shammas, shakes their shoulders, speaks amharic, is an orthodox, and eats doro wat (which is all fine and dandy, but isn't what the majority of us do/or is).
Maybe in the future, we can mature and move on to a different system-I doubt it, but who knows?