It's you who doesn't speak for Somalis.
Genuine Somalis protected their lands and didn't allow thousands of hostile foreigners with whom we have land disputes to walk into Somalia like we're currently seeing. Nor do they advocate for known land grabbers over their own. B00tyclapping for ajanabis like this is unfortunately new phenomena.
Somalis in the West who fled from a civil war can't be compared to Oromos flooding Somali lands. Western countries are organised with strong institutions that can withstand foreign interference and no matter how long we live in the West, we will never be considered European nor will we ever blend in.
Oromos have a history of coming as miskeens only to then actively take over and rewrite history. Dire Dawa and and even Harar are prime examples of this.
Oromos are free to be kind, hardworking and genuine in their safe, lush green lands. Somalis are not obliged to allow unchecked, illegal immigration of Oromos of who many are not even Muslim and have different cultural practices.
I wish I could drop Somalis like you in the heartlands of Oromia so that you can get a taste of their hospitality towards outsiders and especially Somalis.
I'll never understand how some people (including Somalis) will try to gaslight and minimize the reality on the ground and past/historical occurrences, both intentionally and unintentionally. Most of the time, it's always someone not from the region, and if they are, not from the border areas, mostly affected.
You touched on an important the topic of strong institutions, which we lack. The problem with the ethnic federalism created in the 90s, was that it didn't make these newly created region, where every ethnic group lived, permanent. At the time DDS and even Jigjiga was neglected and underdeveloped, and had fewer non-Somalis. Since then, especially the last 20 years, it has undergone major development. And thereby lots of Ethiopians settling there from other regions. Now to the constitution, if now a region want to break-up/join another state they can chose so. Even in areas, where most of the population being recent settlements and the natives become minority (hypothetically speaking, not forecasting anything specific here). Which is where the main problem is right now, without a clause in the constitution.
Last consensus from the turn of the century, based on Ethiopian CSA, Somalis were 60% and Oromos/Amharas 30% in Jigjiga city. If in a near future Somalis becomes minority, they can legally try to split from the Somali state. (Not saying that is their intentions or scaremongering, just pointing out flaws in the constitution, especially as Jigjiga in this case is close to the border too). Don't know how accurate these figures are, but lately there has been a large wave of Highlanders moving here, mostly Amharas, through coordinations with DDS state officials. As if it's intentional and it's no secret to all inhabitants here. Even the opposition called out the DDS authorities. The demographic numbers of foreigners are much higher today. Which most other Ethiopian regions, don't allow this type/way of settlements, except us.
Look at Dire Dawa today, where the region is said to have "25%" Somalis, even though that figures was much higher not too long ago. But due to recent historical event, it has gone down much, especially after the war, through displacement, forced relocation of Somalis. And the settlement of other Ethiopians there Amharas/Oromos, both voluntarily and with state involvement. Mainly in the city, but the country side/Dire Dawa region still has mostly Somali inhabitants. Despite this, today it's a disputed area. And there are attempts to incorporate into Oromia. The same might happens to Jigjiga/Fafan region soon, if continued in the same direction as today, and other regions.
Being sceptical is therefore not illogical, coupled with historical movements/changes in the region. This has nothing to do with hating or creating animosity with Oromos, Amharas, Afars etc. on an individual level, as most of them are nice people, just trying to live and make end meets. But being rational and wanting to create a system, so we can live together without recent migration having to dictate the future of a region, that has been historical home to a certain people. In DDS. Today we have fightings, even areas where Somalis are majority in north, taken over by Afar militias. We also share most of our borders with Oromos. Border area communities shares this sentiments. Unfortunately this will continue, until a sustainable solution, satisfying all people involved are achieved.