>Web devs love the word "jarring" like it's some world shattering visual effect. I've never been a web dev. I'm just explaining why the typical mainstream end users who don't have the same patience as HN-type techies (who more happily accept MPA) do not like the discontinuous UI of reloading pages.
Another example of that SSR MPA page reload/refresh would be old Mapquest before 2006. Screenshot: https://www.e-education.psu.edu/geog160/sites/www.e-educatio...
Each click on North/South/East/West buttons and Zoom In/Out blanked out the entire page and loaded a new page to shift the map viewport. This was a suboptimal UI experience for the typical user. I concede it wasn't "jarring" to you but it was to a lot of users -- especially compared to a CDROM maps experience. Example video of a smoother maps UI experience circa ~2000 from Microsoft CDROM desktop software without "blank reloading pages" to move a map around and change zoom levels: https://www.youtube.com/watch?v=4YO_KGdsUm4
The Mapquest "MPA page reloads" from 2006 was a UI that was less smooth than the Microsoft Streets CD software from 2000.
In 2005, when Google launched Google Maps with extensive usage of Javascript live-loading map tiles to provide smooth scrolling without reloading pages, end users liked that UI because it felt more interactive. In response, Mapquest also eventually switched away from the old-style SSR MPA page reloads: https://techcrunch.com/2007/10/12/exclusive-mapquest-plays-c...
The 2005 SPA-style of Google Maps just gets the UI back to what users already experienced in 2000 with desktop software. The SSR MPA page reloads was something that end users endured with Mapquest but it wasn't actually the UI they really wanted.
I'm not advocating the web devs use SPA (or SPA frameworks). Instead, I'm saying that responding with "SPA websites can be redone as MPA and it's trivial" is saying something that's true but still doesn't actually address the issue that mainstream endusers don't like the discontinuity of MPA type of UIs. That's the subthread I was addressing: https://news.ycombinator.com/item?id=38901249
E.g. McMaster.com is not a "web app" like Figma/Photopea but users prefer the SPA-style UI of that parts catalog website.