Tribes are native characteristics of the Somali society. You can’t do away in laws, but you can regulate them, as you say, in social construct as we did in 4.5 clan power-sharing approach. So far, nobody came up with a better construct, where the rights of minority are better protected as in 4.5. Its problems, though, lie in minorities disregarding the numerical superiority of the majority, and demanding more than equal rights in everything.
In a true one-person-one-vote scenario, Somali minorities have no chance of securing representation, in which case there wouldn’t be genuine democracy. It would be a tyranny of the majority. So, reserving quota for minorities would be necessary under any construct.
What you call provinces in Canadian federalism is called here “Dawlad-Gobolleed”. It is the same thing, where the Indians, French, English and immigrants in the Province of Quebec, for example, act in the same way as tribes in Somalia, with Somalis in the Dawlad-Gobolleed having closer affinity, an advantage rather than disadvantage.