I would bet Hasbro wants a d20 system right for all the genres, but to create a d20 sci-fi 100% compatible with D&D 5th Ed is a serious challenge for the game designers because modern arms break easily the power balance. A dinosaur could be a menace for Conan the barbarian or Tarzan, but Flash Gordon or Buck Rogers only would need one shot with his ray gun. Of course you can play Star Wars d20, but d20 Street Fighters can't face d20 Overwatch or d20 doom slayer/marine is too hard for d20 Mortal Kombat. Have you play Resident Evil or Evil Within? You can imagine what happens when the PC has got enough weapons and ammo. Other example is Sylvester Stallone's movie "Cobra". Bridgitte Nielsen only could hide and run away when the night-slasher appeared, but the cop Cobretti could face all the cult of the new dawn. Other example is when Buffy the vampire slayer only neede a shot (with a RPG, I mean Rocket Propelled Grenade) against the Judge (season 2 episode 14)
Let's imagine a goblin in a Gamma World game. With only a spear and a shield is easy to be killed, but when he has got a sniper rifle from the top of a tree or in a window then the things are different. Now let's imagine with a exosuit (Battlefield: Advance Warfared), a powered armor (Fallout or Anthem videogames), a Mecha (Titanfall or Pretty Boy within Jackopt, the final DLC of a Borderlands DLC).
With modern technology you can drive a truck to run over a horde of zombies, or use homemade explosive traps.
What if a player asks biotechnology for her druid PC? Technically they aren't metallic armours. And the new materials, for example graphene, to craft modern armours? The classic metal becomes obsolete.
We know there is a future new-IP sci-fi videogame using d20 system. I guess they are discovering a lot of things with the playtesting.
I dare to say Hasbro is the first one who wants a d20 sci-fi to publish adaptations of famous IPs (Fortnite: Save the World, Star-Craft, Overwatch, Resident Evil) but trying being 100% retrocompatible with D&D is different.
* Gamma World with the antropomorphic animals are perfect to sell toys.
(Do you remember the battle beasts?)
Badder or digger-folk, one of the humanoid races from Gamma World.