That's literally the biggest (publicly known) Angular app in existence, and the fact that it's slow doesn't have anything to do with Angular. E.g. FWD:Everyone pages load in well under half a second:
https://www.fwdeveryone.com/t/K3KKGbMyQbaCGDc-izuaow/venmo-f...
At this point the main things preventing it from being faster are the TTFB from CloudFront, and the fact that Bootstrap is used as a dependency.
That must be a fairly large application. Consider they are pushing it internally, I have no idea how optimized that is.
When you consider this is cached, that means you only have to do that once until an update. Similar to any other software.
Look at what Electron apps do in terms of constant updates. This is similar, but it's a web page.
And the problem is not only the bytes loaded but how clunky and slow it is in general.
The Electron argument doesn't make any sense as it includes two runtimes ffs.
Eg: Google Cloud console downloads like 20MB of resources.
Maybe the DX is good, but from an end user perspective, Angular is far from good.