Old article: https://www.figma.com/blog/webassembly-cut-figmas-load-time-...
So neither of those are a good argument in favour of these complicated javascript stacks, are they?
Here's an example of libreoffice running entirely in the browser: https://lab.allotropia.de/wasm/
Once it does it's painfully long download and bootstrap it works pretty nicely. This is a big complicated legacy app, but I'm sure if reasonable file sizes and graceful loading was an actual goal you could get some pretty good results. Sure, it's not going to be as easy to hire for right now, but I think for complicated programs that general kind of workflow is likely to be better than the big pile of JS scripts.
Google seems to think the same if flutter is any indication.