As I posted in another thread, leave advantage mechanic for situational...situations. Replace abilities of all races with proficiency instead. So half orcs are proficient with intimidate, and if situation warrants, they also get advantage on the check.
IMO the rational of the current design choice is that it avoids overlapping, because
advantage and
proficiency fully "stack".
Advantage increases your chances at succeeding at something you can already do.
Proficiency increases your changes at individual tasks but
also raise both you minimum and maximum results, which means you don't need to roll anymore for the lowest DC and you can reach high DC that you wouldn't if not proficient. This is in general more valuable, also because advantage can be cancelled and it can be moot if you find another source of advantage, while proficiency bonus always stack.
So maybe their first try is to let Races deliver advantage and classes deliver proficiency. That's only for skills and saving throws.
For weapons it's different, in that case both races and classes grant weapon proficiencies, and we have a nice rule that if you get the same twice, you can pick a different one instead. Still, they probably think that advantage on attacks is more valuable than advantage on skills and so they don't want to give permanent advantage with a weapon.
Applying that "pick another" rule to skills and saving throws would of course be another valid possibility, tho they'd need to provide some guidelines on how to handle advantage on narrower cases like advantage on ST vs poisons.
But with the current setup, you only have weapon prof overlaps, the rest doesn't overlap but both things are useful. This leaves the option for your Half-Orc to
also get proficiency in Intimidation and be better than any non-HalfOrc, or just be content with advantage.
I liked when they did this to Knowledge skills a few packets ago: being a Cleric granted advantage on Religion checks, which made you more reliable on low-mid DCs but didn't open up advanced knowledge, which you could choose to pick as a skill or not. But then apparently playtesters didn't like this, so it's very much possible that they'll change Races in the same way like you want to.