The good thing about the dollar is that you will always have the currency since it is centralized, meanwhile, bitcoin can disappear at some point.
Bitcoin cannot be linked to dollars, I think, because Bitcoin has a limited supply of only 21 million in the world, while dollars have no limit, they are printed continuously and there is no basis whatsoever, but our trust in the government, the dollar is centralized, while Bitcoin is decentralized, it's as simple as that, in my opinion.