Yes Next, Nest, Sails, Gatsby, Blitz, Redwood - none of them became a leading framework like Django or Rails or Laravel has, which means being a Node developer and moving between companies or projects you'll probably relearn everything in a different framework.
For me this is just to chaotic and unstable.
I see no difference. PHP has a billion FWs and a billion more CMSs. Python is the same way. Rails is the only example you give that has merit. I mean PHP is a terrible example. I've been coding PHP since around 2007, PHP has Zend FW, Laravel, Cake, Ignitor, Symphony, Silex... it keeps going and going. All I can see from your comment is some biases against JS. You do you on what you want to learn or use. But its not really an argument that holds up imo.
Laravel is the leading PHP framework by far, I don't think it's up for debate. Ruby also has many frameworks (Padrino, Hanami) but it's obvious Rails is the common choice.
Laravel is as much of a leading framework as React/NextJS are the leading frameworks for JS(next 2.5 million weekly downloads on npm, react 15 million). Its almost a 1:1 comparison. In the same way that I already pointed out JS like php, has a million fw but insiders know what the leading ones are. Everyone knows React is the clear on top winner. NextJS is also a clear on top FW. I dont think its up for debate at this point.