You still can write client side only JavaSCript with Unpoly compilers, alpine.js, and probably htmx also has a way to add custom javascript without making jquer

You still can write client side only JavaSCript with Unpoly compilers, alpine.js, and probably htmx also has a way to add custom javascript without making jquery spaghetti. A tool like this that rely on server rendering (or livewire, hotwire, etc) is a perfect replacement for when your user interaction will need to reach to the server anyway (to save data or fetch something, etc). For example, you're not forced to go back to the server to display a modal. You can have it already rendered on beforehand and when clicking a given button just toggle its visibility. Or if you want to mark a todo item as "done" you can just apply the "done" styles with alpine.js or similar and make an async call to the backend that will persist the state, etc. Going full "SPA" just because this is less ideal than state based react, etc does not compensate the overhead of everything else involved in any web application (SEO support, translations, security, authentication, etc) which are incredibly complicated to get right with SPAs.