Yeah, except for the fact that modern Samsung s20 is not really that much more powerful than your s3. Sure it has more RAM, significantly more, but the processor is barely twice as good.
10 years old device has plenty power to run whatever website can offer, apart from maybe some battery degradation. Hell, I have 20 years old laptop that can do that. The reason it doesn’t is not technical, it’s almost exclusively economical, by which I mean “lazy cheap bastards don’t give a flying fuck about the mountains of e-waste we produce”