You can totally reimplement a model that the browser supports natively, but you close off basically every affordance that a page-based approach provides unless you commit to reimplementing things like (among others) accessibility support for screen readers or reader views, usability with nonstandard clients, and interoperability with the client's environment (I guarantee that your custom progress bar doesn't have the same semantics as the loading spinner on my browser tab). Most of these things come effectively for free with regular pages, so I don't see what benefit doing extra work to reduce your product's flexibility has if a page-based model already suits your content in the first place.
You are talking in abstracts. What does nonstandard clients or interoperability with the client's environment specifically mean ?
And all modern day screen readers support SPA applications. They wouldn't be much use if they couldn't and is the reason you have SPA sites amongst major enterprise companies (who always comply with accessibility policies).
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You can totally reimplement a model that the browser supports natively, but you close off basically every affordance that a page-based approach provides unless you commit to reimplementing things like (among others) accessibility support for screen readers or reader views, usability with nonstandard clients, and interoperability with the client's environment (I guarantee that your custom progress bar doesn't have the same semantics as the loading spinner on my browser tab). Most of these things come effectively for free with regular pages, so I don't see what benefit doing extra work to reduce your product's flexibility has if a page-based model already suits your content in the first place.
You are talking in abstracts. What does nonstandard clients or interoperability with the client's environment specifically mean ?
And all modern day screen readers support SPA applications. They wouldn't be much use if they couldn't and is the reason you have SPA sites amongst major enterprise companies (who always comply with accessibility policies).