The problem is not with advanced tools, but with incentives.
Most sites exist to bring a profit. If they are paid / subscription-based, they can be nice as heck. If sell a product, they make examining and buying it as effortless as they can.
But the rest of for-profit sites are vehicles to sell eyeballs to advertisers. They afford to the advertisers as much comfort as they can without turning too much readers away. They exist not for the readers' convenience.
Most sites exist to bring a profit. If they are paid / subscription-based, they can be nice as heck. If sell a product, they make examining and buying it as effortless as they can.
But the rest of for-profit sites are vehicles to sell eyeballs to advertisers. They afford to the advertisers as much comfort as they can without turning too much readers away. They exist not for the readers' convenience.