The concern is not about race conditions or shared memory where two things would be editing it at a time. Even though the server always renders it first then th

The concern is not about race conditions or shared memory where two things would be editing it at a time. Even though the server always renders it first then the frontend, you still need to share knowledge across both the backend and frontend about all the details of all the components to know how to change the values in jquery or whatever you want to do. Any time you change something on the backend, you have to make sure the jquery stuff is updated to still work, and potentially in many different places if you have different interactions that can update the same state. It makes for very tightly coupled and brittle code. It’s still a matter of preference, you might still prefer that over a full frontend react codebase. But having seen both nightmare jquery messes and react messes, they can both be painful to work with. I definitely don’t agree that things were much simpler in the old days.