And SSAA is just a resolution slider nowadays, and when that doesn't work you can usually find a way in drivers, be it DLDSR or VSR
Downsampling is not quite the same as SSAA. I'm no expert, so I'm not gonna pretend to know how it works, but there's a substantial visual difference.
I especially remember early Euro Truck Simulator 2 days. It was a DX9 game back then, so you could force all kinds of AA in NV Inspector, but the game also had internal scaling. I was playing at 1080p, and using SGSSAAx2 looked sooo much cleaner than downscaling even from 4K. SGSSAAx4 looked absolutely perfect, and that's not even the full on SSAA.
There were also different compatibility flags that would change the visual output. Some were blurrier than others.
Another game with horrible aliasing is Destiny 2. Even if you play in 4K with 200% scaling (which means 8K), there are still many jaggies everywhere, it can never look perfect. I expect an actual SSAA implementation would do a much better job, but I'd rather just see DLAA for performance reasons.
Alien Isolation also has some crazy aliasing (specular or whatever), which you can never eliminate using downsampling. But I think there are some TAA mods for it, which clean it up nicely.
That's exactly why TAA was invented, and why all these new upscalers are based on it. It has drawbacks, but purely from an "eliminating jaggies" perspective, it's the most superior method, and it has an extremely low performance cost. MSAA and SSAA stopped being viable a long time ago, as they both have a high cost and a weak end result in modern games.