The "Dominance of 5E" is very apparent on... 5E sites.
A bit more seriously, I think a major part of what you see is not just that 5E is dominant, but that the OTHER games are splintered. The last version of the Orr Report I can find (from Q3 2021), gave 53.7% of Roll20 play to D&D 5E, 11.9% to Call of Cthulhu, 3.2% to Pathfinder, 1.4% to PF2, and everything else below 1%.
And for any commercial news site, this causes problems. If those percentages are backed up, then if you write an article about D&D 5E, you might get 5,000 views, while for one of the <1% you get 100 views... if you're lucky. And when you depend on clicks for ad revenue so your site can continue, that's a problem.
When I think of the big games of the 1980s, I think of RuneQuest, Traveller, Paranoia, Call of Cthulhu, James Bond 007, Rolemaster, Palladium, Marvel Super Heroes, GURPS, and late in the decade, Star Wars d6.
And I'm not even sure that all of those deserve to be on the list.

(I probably have missed one).
Just looking at a list on Wikipedia for RPGs released in 1983 (I assume, partial), most of them are utterly unknown to me.
- Droids
- Element Masters
- Espionage!
- James Bond 007
- Lands of Adventure
- Lords of Creation
- Mach: The First Colony
- Mercenaries, Spies and Private Eyes
- Other Suns
- Palladium Fantasy Role-Playing Game
- Powers and Perils
- Privateers and Gentlemen
- Stalking the Night Fantastic
- Star Quest
- Super Squadron
- Superworld
- Timeship
- To Challenge Tomorrow
- The Valley of the Pharaohs
- Victorian Adventure
- Warhammer The Mass Combat Fantasy Role-Playing Game
- Witch Hunt
Yeah, most of the games there didn't get any coverage at all, as well.
These days, because of who I follow on social media, I get a lot of news about Chaosium, D&D, and some PF2 and not much else.