Implementing these library/frameworks are just a small piece of the application. You implement strict development policies and standards that these frameworks wrap around, fit within the architecture. Too many devs rely on the framework to be the architecture.
A SPA is a piece of an overall architecture and these frameworks are still just a piece of the overall architecture.
Almost all of these frameworks can/will assist in strict standardization. Bootstrap is a good example. BS with a well designed style guide is a blessing, without it's the wild west. Angular, React, Vue are all very useful (back button included) if thought out and as part of an architecture.
In the end, they get you much further along with support, than a team could do with vanilla.
A SPA is a piece of an overall architecture and these frameworks are still just a piece of the overall architecture.
Almost all of these frameworks can/will assist in strict standardization. Bootstrap is a good example. BS with a well designed style guide is a blessing, without it's the wild west. Angular, React, Vue are all very useful (back button included) if thought out and as part of an architecture.
In the end, they get you much further along with support, than a team could do with vanilla.